My application was running fine.I make some changes in .cpp file & compiled it and following error occured.When i undo the error again same error is displaying

Qt Code:
  1. ActiveQt" -I"tmp\moc\release_shared" -I"." -I"..\..\..\mkspecs\win32-g++" -o tmp
  2. \obj\release_shared\moc_mainwindow.o tmp\moc\release_shared\moc_mainwindow.cpp
  3. g++ -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-rel
  4. oc -Wl,-s -mthreads -Wl -Wl,-subsystem,windows -o release\SEFC_01.exe object_scr
  5. ipt.SEFC_01.Release -L"c:\Qt\4.4.0\lib" -L"c:\Qt\lib" -L"c:\MinGW\lib" -L"c:\Qt
  6. \4.4.0\lib" -lmingw32 -lqtmain -lQtGui4 -lQtNetwork4 -lQtCore4
  7. C:\MinGW\bin\..\lib\gcc\mingw32\3.4.2\..\..\..\..\mingw32\bin\ld.exe: cannot ope
  8. n output file release\SEFC_01.exe: Permission denied
  9. collect2: ld returned 1 exit status
  10. mingw32-make[1]: *** [release\SEFC_01.exe] Error 1
To copy to clipboard, switch view to plain text mode 

Pls help..