Qt-5.0.1-mingw + Qwt-6.1.0 on Windows7. Error in Compilation with examples

[swamyonline]

hi ppl,
its been long time since i posted a query. , as it was going smooth. recently, i hv downloaded Qt-5.0.1-mingw version and tried to compile it on windows7. but i got the following error when i enabled either of the three (examples, mathlib, playground). pls suggest, where its going wrong.
earlier, i was using Qwt-6.1.0 on Windows7 with Qt-5.0.0 successfully.

this is the error:

mingw32-make[1]: Entering directory 'C:/qwt-6.1.0/examples'
cd animation\ && ( if not exist Makefile C:\Qt\Qt5.0.1\5.0.1\mingw47_32\bin\qmak
e.exe C:\qwt-6.1.0\examples\animation\animation.pro -o Makefile ) && mingw32-mak
e -f Makefile
mingw32-make[2]: Entering directory 'C:/qwt-6.1.0/examples/animation'
C:\Qt\Qt5.0.1\5.0.1\mingw47_32\bin\qmake.exe -o Makefile animation.pro
ASSERT: "fileName.isEmpty() || isAbsolutePath(fileName)" in file Q:\qt5_workdir\
w\s\qtbase/qmake/library/ioutils.cpp, line 61
 
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

mingw32-make[1]: Entering directory 'C:/qwt-6.1.0/examples'
cd animation\ && ( if not exist Makefile C:\Qt\Qt5.0.1\5.0.1\mingw47_32\bin\qmak
e.exe C:\qwt-6.1.0\examples\animation\animation.pro -o Makefile ) && mingw32-mak
e -f Makefile
mingw32-make[2]: Entering directory 'C:/qwt-6.1.0/examples/animation'
C:\Qt\Qt5.0.1\5.0.1\mingw47_32\bin\qmake.exe -o Makefile animation.pro
ASSERT: "fileName.isEmpty() || isAbsolutePath(fileName)" in file Q:\qt5_workdir\
w\s\qtbase/qmake/library/ioutils.cpp, line 61

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

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Thanks in advance.

swamy.