---
title: unknownExtensionCategory
framework: systemextensions
role: symbol
role_heading: Type Property
path: systemextensions/ossystemextensionerror/unknownextensioncategory
---

# unknownExtensionCategory

An error code that indicates the extension manager can’t recognize the extension’s category identifier.

## Declaration

```swift
static var unknownExtensionCategory: OSSystemExtensionError.Code { get }
```

## See Also

### Error Codes

- [OSSystemExtensionError.Code](systemextensions/ossystemextensionerror/code.md)
- [unknown](systemextensions/ossystemextensionerror/unknown.md)
- [missingEntitlement](systemextensions/ossystemextensionerror/missingentitlement.md)
- [unsupportedParentBundleLocation](systemextensions/ossystemextensionerror/unsupportedparentbundlelocation.md)
- [extensionNotFound](systemextensions/ossystemextensionerror/extensionnotfound.md)
- [extensionMissingIdentifier](systemextensions/ossystemextensionerror/extensionmissingidentifier.md)
- [duplicateExtensionIdentifer](systemextensions/ossystemextensionerror/duplicateextensionidentifer.md)
- [codeSignatureInvalid](systemextensions/ossystemextensionerror/codesignatureinvalid.md)
- [validationFailed](systemextensions/ossystemextensionerror/validationfailed.md)
- [forbiddenBySystemPolicy](systemextensions/ossystemextensionerror/forbiddenbysystempolicy.md)
- [requestCanceled](systemextensions/ossystemextensionerror/requestcanceled.md)
- [requestSuperseded](systemextensions/ossystemextensionerror/requestsuperseded.md)
- [authorizationRequired](systemextensions/ossystemextensionerror/authorizationrequired.md)