# eventDidFail(_:withError:) Sent by an `SBApplication` object when a target application returns an error Apple event. ``` func eventDidFail(_ event: UnsafePointer, withError error: any Error) -> Any? ``` ## Parameters `event` A pointer to the Apple event sent to the target application causing the error. `error` An object containing information about the error Apple event. Specific information may be included in the `useInfo` dictionary of the error object. The following table shows the possible keys for this dictionary. |Key |Description | |--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------| |ErrorBriefMessage |A short human-readable description of the error, as an | |ErrorExpectedType |The type of data the target application expected, as an object.| |ErrorOffendingObject|The object that caused the error. | |ErrorString |A full human-readable description of the error, as an  object. | |ErrorNumber |The Apple event error number, as an object. | ## Return Value If you return a result, it will become the result of the that failed. Can be `nil`. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)