{"record":{"id":"6700962c1c50159e","repo":"mem0ai/mem0","slug":"no-valid-messages-found-in-the-messages-list","errorCode":null,"errorMessage":"No valid messages found in the messages list","messagePattern":"No valid messages found in the messages list","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"mem0/llms/langchain.py","lineNumber":90,"sourceCode":"\n        Returns:\n            str: The generated response.\n        \"\"\"\n        # Convert the messages to LangChain's tuple format\n        langchain_messages = []\n        for message in messages:\n            role = message[\"role\"]\n            content = message[\"content\"]\n\n            if role == \"system\":\n                langchain_messages.append((\"system\", content))\n            elif role == \"user\":\n                langchain_messages.append((\"human\", content))\n            elif role == \"assistant\":\n                langchain_messages.append((\"ai\", content))\n\n        if not langchain_messages:\n            raise ValueError(\"No valid messages found in the messages list\")\n\n        langchain_model = self.langchain_model\n        if tools:\n            langchain_model = langchain_model.bind_tools(tools=tools, tool_choice=tool_choice)\n\n        response: AIMessage = langchain_model.invoke(langchain_messages, **kwargs)\n        return self._parse_response(response, tools)\n","sourceCodeStart":72,"sourceCodeEnd":98,"githubUrl":"https://github.com/mem0ai/mem0/blob/001c235229be8795e3834520467bd0d661ed8f34/mem0/llms/langchain.py#L72-L98","documentation":"Error \"No valid messages found in the messages list\" thrown in mem0ai/mem0.","triggerScenarios":"Thrown at mem0/llms/langchain.py:90 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Ensure the messages list contains at least one message with a valid role and non-empty content."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"001c235229be8795e3834520467bd0d661ed8f34","analyzedAt":"2026-08-15T01:55:42.685Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}