title: Run button is greyed out - intellij
body: <p>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?</p>
  
  <p>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.</p>