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.

[bracesproul]

@UdayveerVirk you'll get the model name missing error in studio since the open canvas agent requires a few additional fields to be sent in the configuration for the graph to run. for this reason, it's best only to run it via the web UI

[le-dawg]

Same issue here. I cannot help but notice a discrepancy between the README.md and the Langchain docs.

There doesn't seem to be a "Langgraph API key", these is only Langsmith to be found. Using the Langsmith generated key in the root .env file leads to no improvement.

[matbee-eth]

I am running both services. I have set my supabase API details. It fails.

(base) ➜  open-canvas git:(main) ✗ cd apps/web 
(base) ➜  web git:(main) ✗ yarn dev
yarn run v1.22.21
$ next dev
  ▲ Next.js 14.2.25
  - Local:        http://localhost:3000
  - Environments: .env

 ✓ Starting...
 ✓ Ready in 814ms

(base) ➜  apps git:(main) ✗ cd agents 
(base) ➜  agents git:(main) ✗ yarn dev
yarn run v1.22.21
$ npx @langchain/langgraph-cli dev --port 54367 --config ../../langgraph.json

          Welcome to

╦  ┌─┐┌┐┌┌─┐╔═╗┬─┐┌─┐┌─┐┬ ┬
║  ├─┤││││ ┬║ ╦├┬┘├─┤├─┘├─┤
╩═╝┴ ┴┘└┘└─┘╚═╝┴└─┴ ┴┴  ┴ ┴.js

- 🚀 API: http://localhost:54367
- 🎨 Studio UI: https://smith.langchain.com/studio?baseUrl=http://localhost:54367

This in-memory server is designed for development and testing.
For production use, please use LangGraph Cloud.


info:    ▪ Starting server...
info:    ▪ Initializing storage...
info:    ▪ Registering graphs from /home/acidhax/dev/open-canvas
info:    ┏ Registering graph with id 'agent'
info:    ┗ [1] { graph_id: 'agent' }
info:    ┏ Registering graph with id 'reflection'
info:    ┗ [1] { graph_id: 'reflection' }
info:    ┏ Registering graph with id 'thread_title'
info:    ┗ [1] { graph_id: 'thread_title' }
info:    ┏ Registering graph with id 'summarizer'
info:    ┗ [1] { graph_id: 'summarizer' }
info:    ┏ Registering graph with id 'web_search'
info:    ┗ [1] { graph_id: 'web_search' }
(node:57768) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
info:    ▪ Starting 10 workers
error:   ▪ Error: Failed to Failed to fetch /sessions. Received status [401]: Unauthorized. Server response: {"detail":"Invalid token"}
    at raiseForStatus (file:///home/acidhax/.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/acidhax/.npm/_npx/f7d2da157c771680/node_modules/langsmith/dist/client.js:436:13)
    at async Client._getTenantId (file:///home/acidhax/.npm/_npx/f7d2da157c771680/node_modules/langsmith/dist/client.js:1511:26)
    at async Promise.all (index 1)
    at async file:///home/acidhax/.npm/_npx/f7d2da157c771680/node_modules/@langchain/langgraph-api/dist/cli/entrypoint.mjs:21:45

Turns out I needed to disable LANGCHAIN_TRACING_V2 and set it to false