I m using Qt SDK 4.6.2 on windows

when I compile my project it gives me error
Qt Code: 
  1. C:/Qt/2010.02.1/mingw/bin/mingw32-make: Interrupt/Exception caught (code = 0xc0000005, addr = 0x7c884f9c)
  2. mingw32-make: *** [release-all] Error 255
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The same error occures even if I compile from Command prompt

I have added Qt\mingw\bin and Qt\bin to my system PATH variable

why this error occures?