When you have a project-package name such as 'aaa.pro', then you change the package name to something else like 'aaa.free', then sometimes you get the error in the picture. The only way around it is to reboot the computer. I did this in the drop down menu. It has happened several times over the last few months. I have 2 versions of the same program (pro and free). I adjust the pro version, copy it over as free and make adjustments. When I do, sometimes it gives that error. Not a biggie, but you do have to reboot the computer and then it will be fine.
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