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# Error constants

Error codes for instantiation operations.

## Topics

### Constants

[`static var unknown: PTInstantiationError.Code`](/documentation/PushToTalk/PTInstantiationError-swift.struct/unknown)

An instantiation error that indicates an unknown error.

[`static var invalidPlatform: PTInstantiationError.Code`](/documentation/PushToTalk/PTInstantiationError-swift.struct/invalidPlatform)

An instantiation error that indicates the API isn’t available on the simulator or macOS devices.

[`static var missingBackgroundMode: PTInstantiationError.Code`](/documentation/PushToTalk/PTInstantiationError-swift.struct/missingBackgroundMode)

An instantiation error that indicates the app doesn’t have the background mode in an enabled state.

[`static var missingPushServerEnvironment: PTInstantiationError.Code`](/documentation/PushToTalk/PTInstantiationError-swift.struct/missingPushServerEnvironment)

An instantiation error that indicates the app doesn’t have the push notification capability in an enabled state.

[`static var missingEntitlement: PTInstantiationError.Code`](/documentation/PushToTalk/PTInstantiationError-swift.struct/missingEntitlement)

An instantiation error that indicates the app is missing the entitlement.

[`static var instantiationAlreadyInProgress: PTInstantiationError.Code`](/documentation/PushToTalk/PTInstantiationError-swift.struct/instantiationAlreadyInProgress)

An instantiation error that indicates there’s already an in-flight instantiation request.


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