# SandboxTokenVerificationError

> **Class** in `langsmith`

📖 [View in docs](https://reference.langchain.com/python/langsmith/sandbox/_verify/SandboxTokenVerificationError)

Raised when a sandbox user token or callback signature fails verification.

## Signature

```python
SandboxTokenVerificationError()
```

## Extends

- `SandboxClientError`

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[View source on GitHub](https://github.com/langchain-ai/langsmith-sdk/blob/a39745c67839496a98e5e846122664d8070c8dca/python/langsmith/sandbox/_verify.py#L43)