Failed to Failed to fetch /sessions. Received status [401]: Unauthorized

[mistdream11]

In the course of Setting up LangGraph Server, Navigate to apps/agents and run yarn dev,there are errors below.

error: ▪ Error: Failed to Failed to fetch /sessions. Received status [401]: Unauthorized. Server response: {"detail":"Invalid token"}
at raiseForStatus (file:///home/zsh/.npm/_npx/f7d2da157c771680/node_modules/langsmith/dist/utils/error.js:82:11)
at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
at async Client._getPaginated (file:///home/zsh/.npm/_npx/f7d2da157c771680/node_modules/langsmith/dist/client.js:436:13)
at async Client._getTenantId (file:///home/zsh/.npm/_npx/f7d2da157c771680/node_modules/langsmith/dist/client.js:1511:26)
at async Promise.all (index 1)
at async file:///home/zsh/.npm/_npx/f7d2da157c771680/node_modules/@langchain/langgraph-api/dist/cli/entrypoint.mjs:22:45

[deanchanter]

I am getting the same error

[MirkoMContinuum]

Make sure your Langchain API key for LangSmith is correctly set up in your .env file—that was the issue for me.

[UdayveerVirk]

Does that resolve the issue because it didn't work out for me. Once I altered the .env file and changed the api key to mine, i used the yarn dev command again. But the issue persists. I am running it locally. Also if i write anything in the chatbox it shows no assistant id found. Can this be caused by the earlier fetching issue.

[bracesproul]

hi @UdayveerVirk that error looks like the web client isn't able to connect to your LangGraph server. Ensure you have both the web server & the backend server running:

Web server:

cd apps/web

yarn dev

Backend LangGraph server:

cd apps/agents

yarn dev

[UdayveerVirk]

Hi!! @bracesproul , thanks for reaching out. I tried this alternative too but the issue still persists. I am not using any api key for web searching or firecrawl api. Could this cause an issue.

also it is mentioned that if you run locally you need to set Langgraph_API_URL in constants.js, where i have stored just my LANGCHAIN_API_KEY (basically the langsmith api key). Is something else to be stored in this variable? If yes than from where do i get this langgraph api url?

In langsmith studio i am getting this issue.

I have tried using both pats api key and service api key. But the issue persists. Also the human msg "hi" in langsmith sudio did not appear when i wrote it on the localhost web page, i have given this input manually.

Though I am not sure but I feel like the issue has something to do with the assistant id. At bottom right it shows no assistant id. Can you help me with that.
I have tried creating a new assistant but unable to do so.

[karangoyal03]

n dev

Backend LangGraph server:

cd apps/agents

yarn dev

This solution is not working for me , as i am running both the agents as well as web. Still facing the same issue.