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# AppExtensionPoint.Error

Error codes for monitor-related requests.

```
enum Error
```

## Topics

### Getting the error codes

[`case hostMustBeApplicationOrAppExtension`](/documentation/ExtensionFoundation/AppExtensionPoint/Error/hostMustBeApplicationOrAppExtension)

An error that indicates the definition of an extension point in an unsupported target.

[`case hostMustDefineAppExtensionPoint(String)`](/documentation/ExtensionFoundation/AppExtensionPoint/Error/hostMustDefineAppExtensionPoint(_:))

An error that indicates an attempt to define an extension point outside an app.

[`case hostMustHaveBundleIdentifier`](/documentation/ExtensionFoundation/AppExtensionPoint/Error/hostMustHaveBundleIdentifier)

An error that indicates the host app is missing its bundle identifier.

[`case invalidAppExtensionPoint`](/documentation/ExtensionFoundation/AppExtensionPoint/Error/invalidAppExtensionPoint)

An error that indicates an attempt to bind to an unknown extension point.

[`case unspecifiedAppExtensionPointName`](/documentation/ExtensionFoundation/AppExtensionPoint/Error/unspecifiedAppExtensionPointName)

An error that indicates the specified extension point is unknown.

## Relationships

### Conforms To

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`Sendable`](/documentation/Swift/Sendable)

[`Error`](/documentation/Swift/Error)

---

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