score:48

Here is a manual solution of a such situation:

  • find the process (PID) listening on port 3200 (check it in settings>scala>tcp port)
    • on Mac(Linux): lsof -i :3200
  • check that process
    • on Mac(Linux): ps axu |grep <PID>
    • in my case it ended with org.jetbrains.plugins.scala.nailgun.NailgunRunner 3200
  • kill the process, it is some old one and IDEA will start the new one
    • on Mac(Linux): kill -9 <PID>

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