# LangSmithAuthError

> **Class** in `langsmith`

📖 [View in docs](https://reference.langchain.com/python/langsmith/utils/LangSmithAuthError)

Couldn't authenticate with the LangSmith API.

## Signature

```python
LangSmithAuthError()
```

## Extends

- `LangSmithError`

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[View source on GitHub](https://github.com/langchain-ai/langsmith-sdk/blob/52e79add98f6559235d1eb00f5f533b9be6d4cf6/python/langsmith/utils.py#L62)