> ## Documentation Index
> Fetch the complete documentation index at: https://cndoc-langchain.site/llms.txt
> Use this file to discover all available pages before exploring further.

# 错误

本页包含在使用 LangChain 和 LangGraph 构建时可能遇到的常见错误的解决指南。

下文引用的错误在代码中抛出时，会具有一个 `lc_error_code` 属性，对应以下代码之一。

| 错误代码                                                                                                |
| --------------------------------------------------------------------------------------------------- |
| [GRAPH\_RECURSION\_LIMIT](/oss/python/langgraph/errors/GRAPH_RECURSION_LIMIT)                       |
| [INVALID\_CHAT\_HISTORY](/oss/python/langgraph/errors/INVALID_CHAT_HISTORY)                         |
| [INVALID\_CONCURRENT\_GRAPH\_UPDATE](/oss/python/langgraph/errors/INVALID_CONCURRENT_GRAPH_UPDATE)  |
| [INVALID\_GRAPH\_NODE\_RETURN\_VALUE](/oss/python/langgraph/errors/INVALID_GRAPH_NODE_RETURN_VALUE) |
| [INVALID\_PROMPT\_INPUT](/oss/python/langchain/errors/INVALID_PROMPT_INPUT)                         |
| [INVALID\_TOOL\_RESULTS](/oss/python/langchain/errors/INVALID_TOOL_RESULTS)                         |
| [MESSAGE\_COERCION\_FAILURE](/oss/python/langchain/errors/MESSAGE_COERCION_FAILURE)                 |
| [MISSING\_CHECKPOINTER](/oss/python/langgraph/errors/MISSING_CHECKPOINTER)                          |
| [MODEL\_AUTHENTICATION](/oss/python/langchain/errors/MODEL_AUTHENTICATION)                          |
| [MODEL\_NOT\_FOUND](/oss/python/langchain/errors/MODEL_NOT_FOUND)                                   |
| [MODEL\_RATE\_LIMIT](/oss/python/langchain/errors/MODEL_RATE_LIMIT)                                 |
| [MULTIPLE\_SUBGRAPHS](/oss/python/langgraph/errors/MULTIPLE_SUBGRAPHS)                              |
| [OUTPUT\_PARSING\_FAILURE](/oss/python/langchain/errors/OUTPUT_PARSING_FAILURE)                     |

***

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    [通过 MCP 将这些文档](/use-these-docs)连接到 Claude、VSCode 等，以获取实时答案。
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    [在 GitHub 上编辑此页面](https://github.com/langchain-ai/docs/edit/main/src/oss/common-errors.mdx) 或 [提交问题](https://github.com/langchain-ai/docs/issues/new/choose)。
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