Run button is greyed out - intellij

arthionne :

I was working on a project in Intellij then suddenly there was a pop up and now the run button is greyed out. It is a Java FX project and it runs with coverage and debug, but the normal run button is greyed out. What could be the problem?

PS: I know I don't give you much to work with but unfortunately it was working and now it isn't, that's all.

Jason :

This has happened to me countless times. One possible problem is that the program is still running in the background and hasn't exited completely. Check your running processes for java applications and see if it exists.

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