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[GH-ISSUE #1507] DOC: <Issue related to /evaluation/how_to_guides/langgraph> #11

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opened 2026-02-17 17:18:59 -05:00 by yindo · 0 comments
yindo commented 2026-02-17 17:18:59 -05:00
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Originally created by @userlerueda on GitHub (Jan 22, 2025).
Original GitHub issue: https://github.com/langchain-ai/docs/issues/1507

While trying out the example in node_target = example_to_state | app.nodes["agent"]

I get the following error:

    node_target = example_to_state | graph.nodes["classify_node"]
                  ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
  File "/usr/local/lib/python3.11/site-packages/langgraph/pregel/read.py", line 255, in __ror__
    raise NotImplementedError()
NotImplementedError

Any ideas on what could be wrong?

Package versions:

langchain                                0.3.14     Building applications w...
langchain-community                      0.3.14     Community contributed L...
langchain-core                           0.3.29     Building applications w...
langchain-mongodb                        0.2.0      An integration package ...
langchain-openai                         0.2.14     An integration package ...
langchain-text-splitters                 0.3.5      LangChain text splittin...
langgraph                                0.2.61     Building stateful, mult...
langgraph-checkpoint                     2.0.9      Library with base inter...
langgraph-sdk                            0.1.48     SDK for interacting wit...
langsmith                                0.1.147    Client library to conne...
Originally created by @userlerueda on GitHub (Jan 22, 2025). Original GitHub issue: https://github.com/langchain-ai/docs/issues/1507 While trying out the example in node_target = example_to_state | app.nodes["agent"] I get the following error: ``` node_target = example_to_state | graph.nodes["classify_node"] ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~ File "/usr/local/lib/python3.11/site-packages/langgraph/pregel/read.py", line 255, in __ror__ raise NotImplementedError() NotImplementedError ``` Any ideas on what could be wrong? Package versions: ``` langchain 0.3.14 Building applications w... langchain-community 0.3.14 Community contributed L... langchain-core 0.3.29 Building applications w... langchain-mongodb 0.2.0 An integration package ... langchain-openai 0.2.14 An integration package ... langchain-text-splitters 0.3.5 LangChain text splittin... langgraph 0.2.61 Building stateful, mult... langgraph-checkpoint 2.0.9 Library with base inter... langgraph-sdk 0.1.48 SDK for interacting wit... langsmith 0.1.147 Client library to conne... ```
yindo added the langsmithexternal labels 2026-02-17 17:18:59 -05:00
yindo changed title from DOC: <Issue related to /evaluation/how_to_guides/langgraph> to [GH-ISSUE #1507] DOC: <Issue related to /evaluation/how_to_guides/langgraph> 2026-06-05 17:24:33 -04:00
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