error while compiling qt application

[aj2903]

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

ActiveQt" -I"tmp\moc\release_shared" -I"." -I"..\..\..\mkspecs\win32-g++" -o tmp
\obj\release_shared\moc_mainwindow.o tmp\moc\release_shared\moc_mainwindow.cpp
g++ -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-rel
oc -Wl,-s -mthreads -Wl -Wl,-subsystem,windows -o release\SEFC_01.exe object_scr
ipt.SEFC_01.Release  -L"c:\Qt\4.4.0\lib" -L"c:\Qt\lib" -L"c:\MinGW\lib" -L"c:\Qt
\4.4.0\lib" -lmingw32 -lqtmain -lQtGui4 -lQtNetwork4 -lQtCore4
C:\MinGW\bin\..\lib\gcc\mingw32\3.4.2\..\..\..\..\mingw32\bin\ld.exe: cannot ope
n output file release\SEFC_01.exe: Permission denied
collect2: ld returned 1 exit status
mingw32-make[1]: *** [release\SEFC_01.exe] Error 1

ActiveQt" -I"tmp\moc\release_shared" -I"." -I"..\..\..\mkspecs\win32-g++" -o tmp
\obj\release_shared\moc_mainwindow.o tmp\moc\release_shared\moc_mainwindow.cpp
g++ -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-rel
oc -Wl,-s -mthreads -Wl -Wl,-subsystem,windows -o release\SEFC_01.exe object_scr
ipt.SEFC_01.Release  -L"c:\Qt\4.4.0\lib" -L"c:\Qt\lib" -L"c:\MinGW\lib" -L"c:\Qt
\4.4.0\lib" -lmingw32 -lqtmain -lQtGui4 -lQtNetwork4 -lQtCore4
C:\MinGW\bin\..\lib\gcc\mingw32\3.4.2\..\..\..\..\mingw32\bin\ld.exe: cannot ope
n output file release\SEFC_01.exe: Permission denied
collect2: ld returned 1 exit status
mingw32-make[1]: *** [release\SEFC_01.exe] Error 1

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Pls help..

[talk2amulya]

the application that you are trying to build is already running..or used by another program..kill the previous instance and then evth will work fine