Hello,
I have installed QT 5.1.1 on my Mac 10.8.4.
When I try to run a project on QT it says:
This application failed to start because it could not find or load the Qt platform plugin "cocoa".
Reinstalling the application may fix this problem.
The program has unexpectedly finished.

I don't find any clue over this error as I followed all the instructions while installation on Mac.
I am not running shadow build and build type is release.