Can't compile on qt on windows error: Process failed with exit code 2

Hi there, help please.

After renaming OF_TARGET_WINGCC to OF_TARGET_MINGW in ofUtils.cpp and putting the path to tesselator.h in ofConstants.h

I solved the this errors but in the end I get this error from Qt:
error: Process failed with exit code 2.
error: The following products could not be built for configuration qtc_Unnamed_a6d8ac80-debug:

I cannot add a debugger I only have a compiler defined on Qt, is that the problem?
I added the paths to environment variables and Qt do not automatically recognize anything.

Thanks