CFURLError.unknownPropertyKeyError Indicates a property key is unknown. Declarationcase unknownPropertyKeyError See AlsoConstantsCFURLError.unknownErrorCFURLError.unknownSchemeErrorCFURLError.resourceNotFoundErrorCFURLError.resourceAccessViolationErrorCFURLError.remoteHostUnavailableErrorCFURLError.improperArgumentsErrorCFURLError.propertyKeyUnavailableErrorCFURLError.timeoutError