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TypeError: onlyChannels[chan].isAvailable is not a function #283

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opened 2026-02-15 18:15:29 -05:00 by yindo · 4 comments
yindo commented 2026-02-15 18:15:29 -05:00
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Originally created by @wlean on GitHub (Jun 11, 2025).

error: ┏ Background run failed:
TypeError: onlyChannels[chan].isAvailable is not a function
at _applyWrites (D:\Project\ve\node_modules.pnpm@langchain+langgraph@0.3.1__ee107da174995a1c7285db6cd939de52\node_modules@langchain\langgraph\src\pregel\algo.ts:374:25)
at PregelLoop.tick (D:\Project\ve\node_modules.pnpm@langchain+langgraph@0.3.1__ee107da174995a1c7285db6cd939de52\node_modules@langchain\langgraph\src\pregel\loop.ts:692:8)
at CompiledStateGraph._runLoop (D:\Project\ve\node_modules.pnpm@langchain+langgraph@0.3.1__ee107da174995a1c7285db6cd939de52\node_modules@langchain\langgraph\src\pregel\index.ts:2179:21)
at async createAndRunLoop (D:\Project\ve\node_modules.pnpm@langchain+langgraph@0.3.1__ee107da174995a1c7285db6cd939de52\node_modules@langchain\langgraph\src\pregel\index.ts:2053:8)

Originally created by @wlean on GitHub (Jun 11, 2025). error: ┏ Background run failed: TypeError: onlyChannels[chan].isAvailable is not a function at _applyWrites (D:\Project\ve\node_modules\.pnpm\@langchain+langgraph@0.3.1__ee107da174995a1c7285db6cd939de52\node_modules\@langchain\langgraph\src\pregel\algo.ts:374:25) at PregelLoop.tick (D:\Project\ve\node_modules\.pnpm\@langchain+langgraph@0.3.1__ee107da174995a1c7285db6cd939de52\node_modules\@langchain\langgraph\src\pregel\loop.ts:692:8) at CompiledStateGraph._runLoop (D:\Project\ve\node_modules\.pnpm\@langchain+langgraph@0.3.1__ee107da174995a1c7285db6cd939de52\node_modules\@langchain\langgraph\src\pregel\index.ts:2179:21) at async createAndRunLoop (D:\Project\ve\node_modules\.pnpm\@langchain+langgraph@0.3.1__ee107da174995a1c7285db6cd939de52\node_modules\@langchain\langgraph\src\pregel\index.ts:2053:8)
yindo closed this issue 2026-02-15 18:15:29 -05:00
yindo commented 2026-02-15 18:15:30 -05:00
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@wlean commented on GitHub (Jun 11, 2025):

Help me, please!
run agent failed……

use:

  • @langchain/langgraph-cli dev

config:

// langgraph.js
{
"node_version": "20",
"dockerfile_lines": [],
"dependencies": [
"."
],
"graphs": {
"sample_agent": "./agent/agent.ts:graph"
},
"env": ".env"
}

@wlean commented on GitHub (Jun 11, 2025): Help me, please! run agent failed…… use: - @langchain/langgraph-cli dev config: // langgraph.js { "node_version": "20", "dockerfile_lines": [], "dependencies": [ "." ], "graphs": { "sample_agent": "./agent/agent.ts:graph" }, "env": ".env" }
yindo commented 2026-02-15 18:15:30 -05:00
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@dqbd commented on GitHub (Jun 17, 2025):

Hello @wlean! Is it possible that you have multiple @langchain/langgraph versions installed? Could you check your PNPM lockfile if @langchain/langgraph is not installed multiple times?

@dqbd commented on GitHub (Jun 17, 2025): Hello @wlean! Is it possible that you have multiple `@langchain/langgraph` versions installed? Could you check your PNPM lockfile if `@langchain/langgraph` is not installed multiple times?
yindo commented 2026-02-15 18:15:30 -05:00
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@dqbd commented on GitHub (Jun 26, 2025):

Closing for now, feel free to reopen if the issue still persists.

@dqbd commented on GitHub (Jun 26, 2025): Closing for now, feel free to reopen if the issue still persists.
yindo commented 2026-02-15 18:15:30 -05:00
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@EpicWerf commented on GitHub (Jul 2, 2025):

@dqbd we recently got this exact same error and aren't sure what's causing it.

Best guess is that there's some sort of minor version mismatch between CopilotKit and LangChain causing this issue, but we've tried using various resolutions, pinning versions, downgrading, upgrading, etc. and haven't been able to find a working solution.

@wlean did you guys end up finding a fix?

Here are our current versions:

		"@copilotkit/react-core": "^1.8.14",
		"@copilotkit/react-ui": "^1.8.14",
		"@copilotkit/runtime": "^1.8.14",
		"@copilotkit/sdk-js": "^1.8.14",

		"@langchain/core": "^0.3.61",
		"@langchain/google-genai": "^0.2.14",
		"@langchain/google-vertexai": "^0.2.14",
		"@langchain/google-vertexai-web": "^0.2.14",
		"@langchain/langgraph": "^0.3.6",
@EpicWerf commented on GitHub (Jul 2, 2025): @dqbd we recently got this exact same error and aren't sure what's causing it. Best guess is that there's some sort of minor version mismatch between CopilotKit and LangChain causing this issue, but we've tried using various resolutions, pinning versions, downgrading, upgrading, etc. and haven't been able to find a working solution. @wlean did you guys end up finding a fix? Here are our current versions: ``` "@copilotkit/react-core": "^1.8.14", "@copilotkit/react-ui": "^1.8.14", "@copilotkit/runtime": "^1.8.14", "@copilotkit/sdk-js": "^1.8.14", "@langchain/core": "^0.3.61", "@langchain/google-genai": "^0.2.14", "@langchain/google-vertexai": "^0.2.14", "@langchain/google-vertexai-web": "^0.2.14", "@langchain/langgraph": "^0.3.6", ```
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Reference: langchain-ai/langgraphjs#283
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