CFURLError.unknownError Indicates an unknown error. Declarationcase unknownError See AlsoConstantsCFURLError.unknownSchemeErrorCFURLError.resourceNotFoundErrorCFURLError.resourceAccessViolationErrorCFURLError.remoteHostUnavailableErrorCFURLError.improperArgumentsErrorCFURLError.unknownPropertyKeyErrorCFURLError.propertyKeyUnavailableErrorCFURLError.timeoutError