dataWithContentsOfURL报错问题

NSError *error = nil;
    NSData* videoData = [NSData dataWithContentsOfURL:[NSURL URLWithString:self.recordFilePath] options:0 error:&error];
    if (nil == videoData || videoData.length <= 0)
    {
        videoData = [NSData dataWithContentsOfFile:self.recordFilePath options:0 error:&error];
    }
    if (videoData.length <= 0 )
    {
        return;
    }
    

第一个if之前的代码会报错,
(lldb) po error Error Domain=NSCocoaErrorDomain Code=256 "未能完成操作。（“Cocoa”错误 256。）" UserInfo=0x174666740 {NSURL=/var/mobile/Containers/Data/Application/FBF2584C-7428-4709-A2F2-80CBD91B6A40/Documents/1.mp4}

百思不得姐,换用第二个OK了
留待来日在做处理吧