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

# MISSING_CHECKPOINTER

你正在尝试使用 LangGraph 内置的持久化功能，但未提供检查点处理器。

当 [`StateGraph`](https://reference.langchain.com/python/langgraph/graph/state/StateGraph) 或 [`@entrypoint`](https://reference.langchain.com/python/langgraph/func/entrypoint) 的 `compile()` 方法中缺少 `checkpointer` 时，会出现此错误。

## 故障排除

以下方法可能有助于解决此错误：

* 初始化一个检查点处理器，并将其传递给 [`StateGraph`](https://reference.langchain.com/python/langgraph/graph/state/StateGraph) 或 [`@entrypoint`](https://reference.langchain.com/python/langgraph/func/entrypoint) 的 `compile()` 方法。

```python theme={"theme":{"light":"catppuccin-latte","dark":"catppuccin-mocha"}}
from langgraph.checkpoint.memory import InMemorySaver
checkpointer = InMemorySaver()

# Graph API
graph = StateGraph(...).compile(checkpointer=checkpointer)

# Functional API
@entrypoint(checkpointer=checkpointer)
def workflow(messages: list[str]) -> str:
    ...
```

* 使用 LangGraph API，这样你就不需要手动实现或配置检查点处理器。API 会为你处理所有持久化基础设施。

## 相关链接

* 了解更多关于[持久化](/oss/python/langgraph/persistence)的信息。

***

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