Errors

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Original Documentation

Documentation Index#

Fetch the complete documentation index at: https://docs.langchain.com/llms.txt Use this file to discover all available pages before exploring further.

This page contains guides around resolving common errors you may find while building with LangChain and LangGraph.

Errors referenced below will have an lc_error_code property corresponding to one of the below codes when they are thrown in code.

Error code
GRAPH_RECURSION_LIMIT
INVALID_CHAT_HISTORY
INVALID_CONCURRENT_GRAPH_UPDATE
INVALID_GRAPH_NODE_RETURN_VALUE
INVALID_PROMPT_INPUT
INVALID_TOOL_RESULTS
MESSAGE_COERCION_FAILURE
MISSING_CHECKPOINTER
MODEL_AUTHENTICATION
MODEL_NOT_FOUND
MODEL_RATE_LIMIT
MULTIPLE_SUBGRAPHS
OUTPUT_PARSING_FAILURE

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Link last verified June 7, 2026. View original ↗
Source: LangChain Docs
Link last verified: 2026-02-26