转载自：http://stackoverflow.com/questions/7164848/arc-error-when-compiling
Simply remove all calls to -release.
You're not allowed to call -release under
ARC because the compiler will insert all the necessary retain/release calls
for you. Read more about ARC here.
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.