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java.lang.NullPointerException: 	at com.intellij.ide.util.treeView.AbstractTreeUi$58.perform(AbstractTreeUi.java:3456)	at com.intellij.ide.util.treeView.TreeRunnable.run(TreeRunnable.java:34)	at com.intellij.util.concurrency.WorkerThread.run(WorkerThread.java:109)	at com.intellij.openapi.application.impl.ApplicationImpl$8.run(ApplicationImpl.java:369)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)