kCFErrorDescriptionKey
kCFErrorDomainCocoa
kCFErrorDomainMach
kCFErrorDomainOSStatus
kCFErrorDomainPOSIX
kCFErrorFilePathKey
kCFErrorLocalizedDescriptionKey
kCFErrorLocalizedFailureReasonKey
kCFErrorLocalizedRecoverySuggestionKey
kCFErrorUnderlyingErrorKey
kCFErrorURLKey