When I try to build any qt project using qt creator I am getting "error: No rule to make target needed by .... stop" message and build stopped.

Example Scenario:
Create a project xyz in folder xyz.

After creating the project and added forms, creating new files etc.

Try to build, "error: xyzmain.cpp No rule to make target needed by .... stop." will be displayed.

please note actual file path is xyz/main.cpp but the error shows without slash (/)like xyzmain.cpp.

Many times I am facing this problem.

If I change the project directory, delete .pro.user file and rebuild the new project it will work perfectly.