java.lang.NullPointerException

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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)
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