Error: Failed to extract schema for "my_agent"

[RaiYashPramod]

ERROR
info: ▪ --> GET /assistants/eac7a2dc-f2ac-5973-91d0-f90689344d99/schemas 500 1s
Error: Failed to extract schema for "my_agent"
at getGraphSchema (file:///Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/@langchain/langgraph-api/dist/graph/load.mjs:69:19)
at async file:///Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/@langchain/langgraph-api/dist/api/assistants.mjs:112:25
at async dispatch (file:///Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/hono/dist/compose.js:22:17)
at async file:///Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/hono/dist/validator/validator.js:81:5
at async dispatch (file:///Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/hono/dist/compose.js:22:17)
at async file:///Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/hono/dist/validator/validator.js:81:5
at async dispatch (file:///Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/hono/dist/compose.js:22:17)
at async file:///Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/@langchain/langgraph-api/dist/http/middleware.mjs:36:9
at async dispatch (file:///Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/hono/dist/compose.js:22:17)
at async logger2 (file:///Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/hono/dist/middleware/logger/index.js:38:5) {
[cause]: TypeError [Error]: Cannot read properties of undefined (reading 'flags')
at getSymbolLinks (/Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/typescript/lib/typescript.js:52206:16)
at getExportsOfModule (/Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/typescript/lib/typescript.js:54099:19)
at Object.getExportsOfModuleAsArray [as getExportsOfModule] (/Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/typescript/lib/typescript.js:54043:27)
at SubgraphExtractor.getSubgraphsVariables (file:///Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/@langchain/langgraph-api/dist/graph/parser/parser.mjs?tsx-namespace=1745835131059:136:38)
at SubgraphExtractor.getAugmentedSourceFile (file:///Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/@langchain/langgraph-api/dist/graph/parser/parser.mjs?tsx-namespace=1745835131059:148:27)
at SubgraphExtractor.extractSchemas (file:///Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/@langchain/langgraph-api/dist/graph/parser/parser.mjs?tsx-namespace=1745835131059:279:46)
at MessagePort. (file:///Users/raiya/.nvm/versions/node/v23.10.0/lib/node_modules/@langchain/langgraph-cli/node_modules/@langchain/langgraph-api/dist/graph/parser/parser.worker.mjs:5:38)
}

I’m encountering an issue where the component attempts to refresh the schema to set the input, but for some reason, mine couldn’t extract the schema, causing it to refresh again. This continuous refresh prevents me from manually setting the input state. Since I’m using it as an API, it doesn’t have a separate folder structure. I’ll share a basic outline of my setup.

// API FUNC1

// API FUNC2

// Graph definition
const buildChatbotGraph = () => {
const graph = new StateGraph({
channels: { ... },
recursionLimit: 50
});

graph.addNode(...);
graph.addEdge(...);

return graph.compile();
};

const chatbotGraph = buildChatbotGraph();

// Actual API endpoint using the graph
const graphChatApi = async (req, res) => {
try {
const { id } = req.params;
const { query } = req.body;
const { sessionId } = req.query;

if (!query) {
  return errorHandler(new Error("Ask a Question"), 400, res);
}

const agent = await Chatbot.findOne({ id });
if (!agent) {
  return errorHandler(new Error("Chatbot not found"), 404, res);
}

const deviceId = getDeviceId(req);
const history = getChatHistory(deviceId, id);

res.writeHead(200, {
  'Content-Type': 'text/event-stream',
  'Cache-Control': 'no-cache',
  'Connection': 'keep-alive'
});

let session = null;
let currentState = null;

if (sessionId) {
  session = await ChatSession.findOne({ sessionId });
  if (!session) {
    return errorHandler(new Error("Session not found"), 404, res);
  }

  session.lastActivity = new Date();
  await session.save();

  currentState = session.state || { ... };
} else {
  const stateKey = `${deviceId}-${id}`;
  currentState = conversationStates.get(stateKey) || { ... };
}

const updatedState = {
  ...currentState,
  input: query,
  messages: [],
  deviceId,
  namespace: id,
  sessionId
};

const result = await chatbotGraph.invoke(updatedState);

const finalState = {
  ...result,
  deviceId,
  namespace: id,
  sessionId
};

if (session) {
  await session.addMessage('user', query);
  session.state = finalState;
  await session.save();
} else {
  conversationStates.set(`${deviceId}-${id}`, finalState);
}

if (result.responseChunks?.length > 0) {
  for (const [index, chunk] of result.responseChunks.entries()) {
    res.write(`data: ${JSON.stringify({ text: chunk, chunkIndex: index, totalChunks: result.responseChunks.length })}\n\n`);
    await new Promise(resolve => setTimeout(resolve, 100));
  }
} else {
  res.write(`data: ${JSON.stringify({ text: "I'm sorry, I couldn't process that properly. Please try again." })}\n\n`);
}

res.write(`data: ${JSON.stringify({ text: '[DONE]' })}\n\n`);

} catch (error) {
console.error("Error processing query:", error);
res.write(data: ${JSON.stringify({ error: error.message })}\n\n);
} finally {
res.end();
}
};

// API FUNC4

// Module exports
module.exports = {
chatbotGraph,
graphChatApi,
// other API functions...
};

[lzx411559669]

I also encountered this problem. May I ask if you have solved it

[amitchaudharyc]

Hey, I am also running into same issue. Any luck on how to solve this?

[amitchaudharyc]

Just found the answer. I downgraded the node version to 20.13.1 and it worked.

[wwsun]

not works