# Error Constants Error code constants for framework operations. ## Topics ### Error Code Constants [`static var badEventEntry: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/badEventEntry) An event is missing a required field. [`static var badParameterEntry: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/badParameterEntry) A parameter in an event is missing a required field. [`static var engineNotRunning: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/engineNotRunning) Your app requested haptic playback when the engine wasn’t running. [`static var engineStartTimeout: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/engineStartTimeout) The haptic engine timed out while starting. [`static var fileNotFound: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/fileNotFound) The system couldn’t find an audio file or haptic asset. [`static var insufficientPower: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/insufficientPower) The operation failed due to power restrictions. [`static var invalidAudioResource: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/invalidAudioResource) A pattern dictionary or an event array contain a reference to an invalid audio resource. [`static var invalidAudioSession: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/invalidAudioSession) The system invalidated the audio session associated with the haptic engine. [`static var invalidEngineParameter: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/invalidEngineParameter) Your app attempted to initialize the haptic engine with an invalid configuration parameter. [`static var invalidEventDuration: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/invalidEventDuration) An event in the dictionary has an invalid duration. [`static var invalidEventTime: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/invalidEventTime) The time of an event in the dictionary is invalid. [`static var invalidEventType: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/invalidEventType) The type of an event in the dictionary is invalid. [`static var invalidParameterType: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/invalidParameterType) A pattern dictionary or parameter array contains an unknown or invalid parameter type. [`static var invalidPatternData: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/invalidPatternData) Your app passed an invalid pattern to the haptic engine or player. [`static var invalidPatternDictionary: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/invalidPatternDictionary) A pattern in the dictionary is missing a required field. [`static var invalidPatternPlayer: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/invalidPatternPlayer) The current pattern player is no longer valid due to a server error. [`static var invalidTime: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/invalidTime) The time offset passed to the haptic engine is invalid. [`static var memoryError: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/memoryError) The operation failed due to a lack of memory. [`static var notSupported: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/notSupported) The current device doesn’t support the haptic engine. [`static var operationNotPermitted: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/operationNotPermitted) Your app requested an operation that the haptic engine disallows. [`static var resourceNotAvailable: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/resourceNotAvailable) The framework didn’t locate a named resource. [`static var serverInterrupted: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/serverInterrupted) Your app lost its connection to the haptic server. [`static var serverInitFailed: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/serverInitFailed) The haptic server failed to initialize. [`static var unknownError: CHHapticError.Code`](/documentation/CoreHaptics/CHHapticError/unknownError) An operation failed due to an unknown error. --- 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)