Activator `.sbt.ivy.lock` is not available

If nothing works, the last step is to kill the .lock file.

The .sbt.ivy.lock file is used to synchronize access to your local ivy2 repository between several processes so they cannot modify the directory simultaneously. Usually the situation that you described happens when you have an IDE and Activator/sbt terminal running at the same time.

Even though you killed the Idea Process there could be another process spawned which was causing the lock so next time make sure that you kill all Java processes. However, the best solution for this issue is to avoid locking one process with another. So run only one process which uses the ivy2 repository at the same time.