> For the complete documentation index, see [llms.txt](https://doc.ozforensics.com/oz-knowledge/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.ozforensics.com/oz-knowledge/guides/developer-guide/sdk/oz-liveness-websdk/web-plugin/launching-the-plugin/description-of-the-on_error-callback.md).

# Description of the on\_error Callback

This callback is called when the system encounters any error. It contains the error details and telemetry ID that you can use for further investigation.

```json
on_error { 
    "code": "error_code", 
    "event_session_id": "id_of_telemetry_session_with_error", 
    "message": "<error decription>", 
    "context": {}  // additional information if any
}
```

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