I have managed to solve this problem myself.

thankyou so much for the help.

the Qt is really not configured with thread support.

but is there any means to know wheather the qt has been configured with the thread support or not.

and what are the arguments that has to be passed with configure so that thread support is included in Qt.

The way i have solved this problem is very unusual.
I deleted the project folder. Then i created the new project file and did the same thing which i had done previously. It worked and no errors were generated.
The exe is also running as expected.


Thanks and regards
shamik