> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-7021d5f4.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# UnprocessableEntityResponseError - Python SDK

> UnprocessableEntityResponseError error handling

<Warning>
  The Python SDK and docs are currently in beta.
  Report issues on [GitHub](https://github.com/OpenRouterTeam/python-sdk/issues).
</Warning>

Unprocessable Entity - Semantic validation failure

## Fields

| Field                 | Type                                                                                                                                 | Required             | Description                                | Example                                       |
| --------------------- | ------------------------------------------------------------------------------------------------------------------------------------ | -------------------- | ------------------------------------------ | --------------------------------------------- |
| `error`               | [components.UnprocessableEntityResponseErrorData](/client-sdks/python/api-reference/components/unprocessableentityresponseerrordata) | :heavy\_check\_mark: | Error data for UnprocessableEntityResponse | `{"code": 422,"message": "Invalid argument"}` |
| `openrouter_metadata` | Dict\[str, *Nullable\[Any]*]                                                                                                         | :heavy\_minus\_sign: | N/A                                        |                                               |
| `user_id`             | *OptionalNullable\[str]*                                                                                                             | :heavy\_minus\_sign: | N/A                                        |                                               |