iOS初级魔法师

报错如图下：Compress PNG Files Error         While reading XXXXXX pngcrush caught libpng error;         Could not find file: XXXXXX          Command XXXXXX emitted errors but did not return a nonzer

如下代码， UIAlertView *alertView=[[UIAlertView alloc]initWithTitle:@"提示" message:@"恭喜你答对了" delegate:nil cancelButtonTitle:@"点击取消" otherButtonTitles:nil]; [alertView show];会提示：