Pro Logic X missing audio files

I continue to get the error message when I open a session: The Audio file “(name).wav” was not found in it’s expected location

It lists two files, both of which I have previously deleted from the Project. I have tried “Search” and “Locate” and even looked in the trash, but I can’t find them. I don’t need them, but it is annoying that every time I open the Project, this error message comes up. Is there a way to stop the message since it is not applicable and the files have been removed from the Project?