このエラーが発生しましたが、ここではどういう意味ですか。
[mediaPlayTime setText:[NSString stringWithFormat:@"%@ / %@", [self formatTime:currentTime],[self formatTime:duration]]];
- (NSString*)formatTime:(float)time{
int minutes = time / 60;
int seconds = (int)time % 60;
return [NSString stringWithFormat:@"%@%d:%@%d", minutes / 10 ? [NSString stringWithFormat:@"%d", minutes / 10] : @"", minutes % 10, [NSString stringWithFormat:@"%d", seconds / 10], seconds % 10];
}