---
title: OSSystemExtensionError.Code.extensionMissingIdentifier
framework: systemextensions
role: symbol
role_heading: Case
path: systemextensions/ossystemextensionerror/code/extensionmissingidentifier
---

# OSSystemExtensionError.Code.extensionMissingIdentifier

An error code that indicates the extension identifier is missing.

## Declaration

```swift
case extensionMissingIdentifier
```

## Discussion

Discussion Make sure that the value in the Info.plist file of your DriverKit extension matches the identifier string you passed to the activationRequest(forExtensionWithIdentifier:queue:) method.

## See Also

### Error Codes

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