This project cannot be launched

Man what a headache this has been.

Out of nowhere, completely random, I go to compile a project and I get “This project cannot be launched”.

Seems as if all my compiler setting have nulled themselves, no warning, no error message, nothing. Everything is just blank.

Looks like it’s a common (somewhat) problem floating around the internet.

Does anyone know why this happens or how to prevent it from happening again?

The only thing I can think of is I had 2 projects open at the same time (which an ex coworker told me a while back is a no no with Flex).

Thanks all

edit: Forgot to add “my” solution. I just deleted the project and recreated it. Just remember to keep a copy of your src class if you are using a library, because that file is deleted once you clear out the project.