# TunnelUnsupportedVersionError

> **Class** in `langsmith`

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

Protocol version mismatch between the tunnel client and the daemon.

## Signature

```python
TunnelUnsupportedVersionError()
```

## Extends

- `TunnelError`

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[View source on GitHub](https://github.com/langchain-ai/langsmith-sdk/blob/3f9fe09d8e0698d65aa8bb63ac3316dfcb2ca947/python/langsmith/sandbox/_exceptions.py#L338)