I have found a way to solve it and if someone else has the same problem: 1000-limit-error is not the same error as @logicat encountered, the problem seems to be that when iOS atomic write to a file, system first create a temporary file and then write data to it, and if the temporary file is accidentally interrupted while writing. For example, [MLModel compileModelAtURL] will temporarily create XXXX /Temp/(A Document Being Saved By yourApp)/***.mlmodelc when it is accidentally interrupted, (A Document Being Saved By ***) - temporary files will not be deleted, causing all atomic writes to fail, even if you restart your app. Try the following solve it(Language: Objective-C): 1.Use nonatomic write, e.g. [NSData writeToFile:path options:0 error:&error]; // No temporary file, nonatomic [NSData writeToFile:path atomically:NO]; [NSString writeToFile:path atomically:NO encoding:enc error:&error]; [NSDictionary writeToURL:url atomically:NO]; 2.To solve the problem completely, you need to remove the temporary file from the problem folder, which is a hidden file like ***/(A Document Being Saved By yourApp)/xxxx So I restore the atomic write ability after I clear the temporary file or temporary folder(Note: Do not delete some files generated by the system). Hope the above tips help you.