# InputFormatError

> **Class** in `langchain_classic`

📖 [View in docs](https://reference.langchain.com/python/langchain-classic/smith/evaluation/runner_utils/InputFormatError)

Raised when the input format is invalid.

## Signature

```python
InputFormatError()
```

## Extends

- `Exception`

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/02991cb4cf2063d51a07268edafb05fe53de1826/libs/langchain/langchain_classic/smith/evaluation/runner_utils.py#L73)