error when building project when executing step 'qmake'

[tarkijowow]

Just installed qt creator 5.1.1 32 bit and i tried to run an example application from qt. It showed me this compile output

19:17:21: Running steps for project application...
19:17:21: Could not start process "C:\Qt\Qt5.1.1\5.1.1\mingw48_32\bin\qmake.exe" C:\Qt\Qt5.1.1\5.1.1\mingw48_32\examples\widgets\ma inwindows\application\application.pro -r -spec win32-g++ "CONFIG+=debug" "CONFIG+=declarative_debug" "CONFIG+=qml_debug"
Error while building/deploying project application (kit: Desktop Qt 5.1.1 MinGW 32bit)
When executing step 'qmake'
19:17:22: Elapsed time: 00:00.

Do you know where the problem is?