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TypeError: Object of type HumanMessage is not JSON serializable #82
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Originally created by @kkwcode on GitHub (Jul 17, 2025).
got error TypeError: Object of type HumanMessage is not JSON serializable
when upgrade langgraph-checkpoint-postgres version to 2.0.23, got error； i must lock the version to 2.0.21, the error is gone.
error condition
error detail
INFO: Waiting for connections to close. (CTRL+C to force quit)
ERROR: Exception in ASGI application
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/_utils.py", line 76, in collapse_excgroups
| yield
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/responses.py", line 263, in call
| async with anyio.create_task_group() as task_group:
| ^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_anyio/site-packages/anyio/_backends/_asyncio.py", line 772, in aexit
| raise BaseExceptionGroup(
| ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
+-+---------------- 1 ----------------
| Traceback (most recent call last):
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_uvicorn/site-packages/uvicorn/protocols/http/h11_impl.py", line 403, in run_asgi
| result = await app( # type: ignore[func-returns-value]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_uvicorn/site-packages/uvicorn/middleware/proxy_headers.py", line 60, in call
| return await self.app(scope, receive, send)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_fastapi/site-packages/fastapi/applications.py", line 1054, in call
| await super().call(scope, receive, send)
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/applications.py", line 112, in call
| await self.middleware_stack(scope, receive, send)
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/middleware/errors.py", line 187, in call
| raise exc
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/middleware/errors.py", line 165, in call
| await self.app(scope, receive, _send)
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/middleware/exceptions.py", line 62, in call
| await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
| raise exc
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
| await app(scope, receive, sender)
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/routing.py", line 714, in call
| await self.middleware_stack(scope, receive, send)
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/routing.py", line 734, in app
| await route.handle(scope, receive, send)
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/routing.py", line 288, in handle
| await self.app(scope, receive, send)
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/routing.py", line 76, in app
| await wrap_app_handling_exceptions(app, request)(scope, receive, send)
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
| raise exc
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
| await app(scope, receive, sender)
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/routing.py", line 74, in app
| await response(scope, receive, send)
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/responses.py", line 262, in call
| with collapse_excgroups():
| ^^^^^^^^^^^^^^^^^^^^
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/external/python_3_12_x86_64-unknown-linux-gnu/lib/python3.12/contextlib.py", line 158, in exit
| self.gen.throw(value)
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/_utils.py", line 82, in collapse_excgroups
| raise exc
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/responses.py", line 266, in wrap
| await func()
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/responses.py", line 246, in stream_response
| async for chunk in self.body_iterator:
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_copilotkit/site-packages/copilotkit/langgraph_agent.py", line 375, in _stream_events
| async for event in self.graph.astream_events(stream_input, config, version="v2"):
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langchain_core/site-packages/langchain_core/runnables/base.py", line 1403, in astream_events
| async for event in event_stream:
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langchain_core/site-packages/langchain_core/tracers/event_stream.py", line 1021, in _astream_events_implementation_v2
| await task
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langchain_core/site-packages/langchain_core/tracers/event_stream.py", line 976, in consume_astream
| async for _ in event_streamer.tap_output_aiter(run_id, stream):
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langchain_core/site-packages/langchain_core/tracers/event_stream.py", line 204, in tap_output_aiter
| async for chunk in output:
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph/site-packages/langgraph/pregel/__init__.py", line 2596, in astream
| async with AsyncPregelLoop(
| ^^^^^^^^^^^^^^^^
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph/site-packages/langgraph/pregel/loop.py", line 1393, in aexit
| return await exit_task
| ^^^^^^^^^^^^^^^
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/external/python_3_12_x86_64-unknown-linux-gnu/lib/python3.12/contextlib.py", line 754, in aexit
| raise exc_details[1]
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/external/python_3_12_x86_64-unknown-linux-gnu/lib/python3.12/contextlib.py", line 737, in aexit
| cb_suppress = await cb(*exc_details)
| ^^^^^^^^^^^^^^^^^^^^^^
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph/site-packages/langgraph/pregel/executor.py", line 209, in aexit
| raise exc
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph/site-packages/langgraph/pregel/loop.py", line 1260, in _checkpointer_put_after_previous
| await prev
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph/site-packages/langgraph/pregel/executor.py", line 217, in gated
| return await coro
| ^^^^^^^^^^
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph/site-packages/langgraph/pregel/loop.py", line 1260, in _checkpointer_put_after_previous
| await prev
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph/site-packages/langgraph/pregel/executor.py", line 217, in gated
| return await coro
| ^^^^^^^^^^
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph/site-packages/langgraph/pregel/loop.py", line 1262, in _checkpointer_put_after_previous
| await cast(BaseCheckpointSaver, self.checkpointer).aput(
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph_checkpoint_postgres/site-packages/langgraph/checkpoint/postgres/aio.py", line 280, in aput
| await cur.execute(
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_psycopg/site-packages/psycopg/cursor_async.py", line 93, in execute
| await self._conn.wait(
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_psycopg/site-packages/psycopg/connection_async.py", line 439, in wait
| return await waiting.wait_async(gen, self.pgconn.socket, interval=interval)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_psycopg/site-packages/psycopg/waiting.py", line 131, in wait_async
| s = next(gen)
| ^^^^^^^^^
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_psycopg/site-packages/psycopg/_cursor_base.py", line 194, in _execute_gen
| pgq = self._convert_query(query, params)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_psycopg/site-packages/psycopg/_cursor_base.py", line 453, in _convert_query
| pgq.convert(query, params)
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_psycopg/site-packages/psycopg/_queries.py", line 95, in convert
| self.dump(vars)
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_psycopg/site-packages/psycopg/_queries.py", line 106, in dump
| self.params = self._tx.dump_sequence(params, self._want_formats)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "psycopg_binary/_psycopg/transform.pyx", line 351, in psycopg_binary._psycopg.Transformer.dump_sequence
| File "psycopg_binary/_psycopg/transform.pyx", line 402, in psycopg_binary._psycopg.Transformer.dump_sequence
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_psycopg/site-packages/psycopg/types/json.py", line 149, in dump
| if isinstance((data := dumps(obj)), str):
| ^^^^^^^^^^
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/external/python_3_12_x86_64-unknown-linux-gnu/lib/python3.12/json/__init__.py", line 231, in dumps
| return _default_encoder.encode(obj)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/external/python_3_12_x86_64-unknown-linux-gnu/lib/python3.12/json/encoder.py", line 200, in encode
| chunks = self.iterencode(o, _one_shot=True)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/external/python_3_12_x86_64-unknown-linux-gnu/lib/python3.12/json/encoder.py", line 258, in iterencode
| return _iterencode(o, 0)
| ^^^^^^^^^^^^^^^^^
| File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/external/python_3_12_x86_64-unknown-linux-gnu/lib/python3.12/json/encoder.py", line 180, in default
| raise TypeError(f'Object of type {o.class.name} '
| TypeError: Object of type HumanMessage is not JSON serializable
+------------------------------------
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_uvicorn/site-packages/uvicorn/protocols/http/h11_impl.py", line 403, in run_asgi
result = await app( # type: ignore[func-returns-value]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_uvicorn/site-packages/uvicorn/middleware/proxy_headers.py", line 60, in call
return await self.app(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_fastapi/site-packages/fastapi/applications.py", line 1054, in call
await super().call(scope, receive, send)
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/applications.py", line 112, in call
await self.middleware_stack(scope, receive, send)
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/middleware/errors.py", line 187, in call
raise exc
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/middleware/errors.py", line 165, in call
await self.app(scope, receive, _send)
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/middleware/exceptions.py", line 62, in call
await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
raise exc
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
await app(scope, receive, sender)
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/routing.py", line 714, in call
await self.middleware_stack(scope, receive, send)
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/routing.py", line 734, in app
await route.handle(scope, receive, send)
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/routing.py", line 288, in handle
await self.app(scope, receive, send)
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/routing.py", line 76, in app
await wrap_app_handling_exceptions(app, request)(scope, receive, send)
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
raise exc
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
await app(scope, receive, sender)
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/routing.py", line 74, in app
await response(scope, receive, send)
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/responses.py", line 262, in call
with collapse_excgroups():
^^^^^^^^^^^^^^^^^^^^
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/external/python_3_12_x86_64-unknown-linux-gnu/lib/python3.12/contextlib.py", line 158, in exit
self.gen.throw(value)
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/_utils.py", line 82, in collapse_excgroups
raise exc
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/responses.py", line 266, in wrap
await func()
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_starlette/site-packages/starlette/responses.py", line 246, in stream_response
async for chunk in self.body_iterator:
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_copilotkit/site-packages/copilotkit/langgraph_agent.py", line 375, in _stream_events
async for event in self.graph.astream_events(stream_input, config, version="v2"):
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langchain_core/site-packages/langchain_core/runnables/base.py", line 1403, in astream_events
async for event in event_stream:
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langchain_core/site-packages/langchain_core/tracers/event_stream.py", line 1021, in _astream_events_implementation_v2
await task
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langchain_core/site-packages/langchain_core/tracers/event_stream.py", line 976, in consume_astream
async for _ in event_streamer.tap_output_aiter(run_id, stream):
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langchain_core/site-packages/langchain_core/tracers/event_stream.py", line 204, in tap_output_aiter
async for chunk in output:
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph/site-packages/langgraph/pregel/__init__.py", line 2596, in astream
async with AsyncPregelLoop(
^^^^^^^^^^^^^^^^
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph/site-packages/langgraph/pregel/loop.py", line 1393, in aexit
return await exit_task
^^^^^^^^^^^^^^^
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/external/python_3_12_x86_64-unknown-linux-gnu/lib/python3.12/contextlib.py", line 754, in aexit
raise exc_details[1]
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/external/python_3_12_x86_64-unknown-linux-gnu/lib/python3.12/contextlib.py", line 737, in aexit
cb_suppress = await cb(*exc_details)
^^^^^^^^^^^^^^^^^^^^^^
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph/site-packages/langgraph/pregel/executor.py", line 209, in aexit
raise exc
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph/site-packages/langgraph/pregel/loop.py", line 1260, in _checkpointer_put_after_previous
await prev
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph/site-packages/langgraph/pregel/executor.py", line 217, in gated
return await coro
^^^^^^^^^^
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph/site-packages/langgraph/pregel/loop.py", line 1260, in _checkpointer_put_after_previous
await prev
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph/site-packages/langgraph/pregel/executor.py", line 217, in gated
return await coro
^^^^^^^^^^
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph/site-packages/langgraph/pregel/loop.py", line 1262, in _checkpointer_put_after_previous
await cast(BaseCheckpointSaver, self.checkpointer).aput(
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_langgraph_checkpoint_postgres/site-packages/langgraph/checkpoint/postgres/aio.py", line 280, in aput
await cur.execute(
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_psycopg/site-packages/psycopg/cursor_async.py", line 93, in execute
await self._conn.wait(
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_psycopg/site-packages/psycopg/connection_async.py", line 439, in wait
return await waiting.wait_async(gen, self.pgconn.socket, interval=interval)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_psycopg/site-packages/psycopg/waiting.py", line 131, in wait_async
s = next(gen)
^^^^^^^^^
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_psycopg/site-packages/psycopg/_cursor_base.py", line 194, in _execute_gen
pgq = self._convert_query(query, params)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_psycopg/site-packages/psycopg/_cursor_base.py", line 453, in _convert_query
pgq.convert(query, params)
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_psycopg/site-packages/psycopg/_queries.py", line 95, in convert
self.dump(vars)
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_psycopg/site-packages/psycopg/_queries.py", line 106, in dump
self.params = self._tx.dump_sequence(params, self._want_formats)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "psycopg_binary/_psycopg/transform.pyx", line 351, in psycopg_binary._psycopg.Transformer.dump_sequence
File "psycopg_binary/_psycopg/transform.pyx", line 402, in psycopg_binary._psycopg.Transformer.dump_sequence
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/execroot/com_tencent/bazel-out/k8-fastbuild/bin/apps/fc/testcopilot/srcs/tchost/agent/server.runfiles/py_deps_3_12_psycopg/site-packages/psycopg/types/json.py", line 149, in dump
if isinstance((data := dumps(obj)), str):
^^^^^^^^^^
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/external/python_3_12_x86_64-unknown-linux-gnu/lib/python3.12/json/__init__.py", line 231, in dumps
return _default_encoder.encode(obj)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/external/python_3_12_x86_64-unknown-linux-gnu/lib/python3.12/json/encoder.py", line 200, in encode
chunks = self.iterencode(o, _one_shot=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/external/python_3_12_x86_64-unknown-linux-gnu/lib/python3.12/json/encoder.py", line 258, in iterencode
return _iterencode(o, 0)
^^^^^^^^^^^^^^^^^
File "/root/.cache/bazel/_bazel_root/f69f610f7cb944c71c7855b8427d317e/external/python_3_12_x86_64-unknown-linux-gnu/lib/python3.12/json/encoder.py", line 180, in default
raise TypeError(f'Object of type {o.class.name} '
TypeError: Object of type HumanMessage is not JSON serializable
@justanotherbody commented on GitHub (Jul 19, 2025):
I get approximately the same error, but for SystemMessage being not JSON serializable.
Pinning to 2.0.21 for now
@alberto-agudo commented on GitHub (Jul 21, 2025):
Related with this issue in langgraph
@averikitsch commented on GitHub (Jul 28, 2025):
Please follow up with the issue in the Langgraph repo. Thanks!