转载自：http://stackoverflow.com/questions/7164848/arc-error-when-compiling
Simply remove all calls to-release.
You're not allowed to call-releaseunder
ARC because the compiler will insert all the necessaryretain/releasecalls
for you. Read more about ARChere.
The other way is to use the conversion tool, and Xcode can convert your project to ARC (including removing these calls) for you:
To disable ARC entirely, change your build settings:
However I'd recommend you start using ARC, it will make things a lot easier and actually faster too.