---
title: OSSystemExtensionErrorDomain
framework: systemextensions
role: symbol
role_heading: Global Variable
path: systemextensions/ossystemextensionerrordomain
---

# OSSystemExtensionErrorDomain

The error domain identifying system extension errors.

## Declaration

```swift
let OSSystemExtensionErrorDomain: String
```

## See Also

### Errors

- [OSSystemExtensionError](systemextensions/ossystemextensionerror.md)
- [OSSystemExtensionError.Code](systemextensions/ossystemextensionerror/code.md)