Why Compile without change of Source file?

Why Compile without change of Source file?

I just used the most easy way to compile, link and Run my program --- to add all of my Fortran file in the project, and built or run the program in the
develop studio environment. I didn't change any of my source file, but
when I run the programm from develop studio environment, the next message appeared. --- one or more files are out of data or don't exist, a.exe, c.obj, .... , would you like to rebuild it?

And whether I choose yes or no, the program could be run.

Can you tell me how can I erase this message?


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