# 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/791701a304a72495d108669ef11c194983fd0e95/python/langsmith/sandbox/_exceptions.py#L326)