CMErrorNilData Core Motion didn’t return any data. Declarationvar CMErrorNilData: CMError { get } See AlsoErrorsCMErrorDeviceRequiresMovementCMErrorInvalidActionCMErrorInvalidParameterCMErrorMotionActivityNotAuthorizedCMErrorMotionActivityNotAvailableCMErrorMotionActivityNotEntitledCMErrorNULLCMErrorNotAuthorizedCMErrorNotAvailableCMErrorNotEntitledCMErrorSizeCMErrorTrueNorthNotAvailableCMErrorUnknown