i Was using Qt creator for running demos so that i can get a feel of QT but , i find myself with this error thrown at the QT compile output terminal

Qt Code: 
  1. I'../../../Simulator/Qt/mingw/include' -I'../../../Simulator/Qt/mingw/include/ActiveQt' -I'debug' -I'../../4.7/shared' -I'.' -I'../../../Simulator/Qt/mingw/mkspecs/win32-g++' -o debug/arthurwidgets.o ../../4.7/shared/arthurwidgets.cpp
  2. ../../4.7/shared/arthurwidgets.cpp:54:35: error: private/qpixmapdata_p.h: No such file or directory
  3. mingw32-make[2]: Leaving directory `C:/QtSDK/Demos/demos-build-simulator-Simulator_Qt_for_MinGW_4_4__Qt_SDK__Debug/shared'
  4. mingw32-make[1]: Leaving directory `C:/QtSDK/Demos/demos-build-simulator-Simulator_Qt_for_MinGW_4_4__Qt_SDK__Debug/shared'
  5. mingw32-make[2]: *** [debug/arthurwidgets.o] Error 1
  6. mingw32-make[1]: *** [debug] Error 2
  7. mingw32-make.exe: *** [sub-shared-make_default] Error 2
  8. 13:04:59: The process "C:\QtSDK\mingw\bin\mingw32-make.exe" exited with code 2.
  9. Error while building project demos (target: Qt Simulator)
  10. When executing build step 'Make'
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how to solve this problem ?