java.lang.Throwable: This exception has no message.

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java.lang.Throwable:
at com.intellij.ide.util.treeView.AbstractTreeStructureBase.getChildElements(AbstractTreeStructureBase.java:45)
at com.intellij.ide.util.treeView.AbstractTreeUi$32.perform(AbstractTreeUi.java:1624)
at com.intellij.ide.util.treeView.TreeRunnable.run(TreeRunnable.java:33)
at com.intellij.ide.util.treeView.AbstractTreeUi.execute(AbstractTreeUi.java:1830)
at com.intellij.ide.util.treeView.AbstractTreeUi.getChildrenFor(AbstractTreeUi.java:1621)
at com.intellij.ide.util.treeView.AbstractTreeUi.access$4700(AbstractTreeUi.java:62)
at com.intellij.ide.util.treeView.AbstractTreeUi$31.perform(AbstractTreeUi.java:1546)
at com.intellij.ide.util.treeView.TreeRunnable.run(TreeRunnable.java:33)
at com.intellij.ide.util.treeView.AbstractTreeUi.execute(AbstractTreeUi.java:1830)
at com.intellij.ide.util.treeView.AbstractTreeUi.processUnbuilt(AbstractTreeUi.java:1533)
at com.intellij.ide.util.treeView.AbstractTreeUi.doUpdateChildren(AbstractTreeUi.java:1259)
at com.intellij.ide.util.treeView.AbstractTreeUi.access$3100(AbstractTreeUi.java:62)
at com.intellij.ide.util.treeView.AbstractTreeUi$26$1.perform(AbstractTreeUi.java:1182)
at com.intellij.ide.util.treeView.TreeRunnable.run(TreeRunnable.java:33)
at com.intellij.ide.util.treeView.AbstractTreeUi.execute(AbstractTreeUi.java:1830)
at com.intellij.ide.util.treeView.AbstractTreeUi.access$2500(AbstractTreeUi.java:62)
at com.intellij.ide.util.treeView.AbstractTreeUi$26.perform(AbstractTreeUi.java:1179)
at com.intellij.ide.util.treeView.TreeRunnable.run(TreeRunnable.java:33)
at com.intellij.openapi.util.ActionCallback$ExecutedExecutionCallback.doWhenExecuted(ActionCallback.java:187)
at com.intellij.openapi.util.ActionCallback.doWhenDone(ActionCallback.java:111)
at com.intellij.ide.util.treeView.AbstractTreeUi.updateNodeChildren(AbstractTreeUi.java:1174)
at com.intellij.ide.util.treeView.AbstractTreeUi.updateSubtreeNow(AbstractTreeUi.java:1080)
at com.intellij.ide.util.treeView.AbstractTreeUpdater$3.perform(AbstractTreeUpdater.java:258)
at com.intellij.ide.util.treeView.TreeRunnable.run(TreeRunnable.java:33)
at com.intellij.openapi.util.ActionCallback$ExecutedExecutionCallback.doWhenExecuted(ActionCallback.java:187)
at com.intellij.openapi.util.ActionCallback.doWhenDone(ActionCallback.java:111)
at com.intellij.ide.util.treeView.AbstractTreeUpdater.performUpdate(AbstractTreeUpdater.java:254)
at com.intellij.ide.util.treeView.AbstractTreeUi$13.perform(AbstractTreeUi.java:510)
at com.intellij.ide.util.treeView.TreeRunnable.run(TreeRunnable.java:33)
at com.intellij.openapi.util.ActionCallback$ExecutedExecutionCallback.doWhenExecuted(ActionCallback.java:187)
at com.intellij.openapi.util.ActionCallback.doWhenDone(ActionCallback.java:111)
at com.intellij.ide.util.treeView.AbstractTreeUi.doExpandNodeChildren(AbstractTreeUi.java:506)
at com.intellij.ide.util.treeView.AbstractTreeBuilder.expandNodeChildren(AbstractTreeBuilder.java:355)
at com.intellij.ide.projectView.BaseProjectTreeBuilder.expandNodeChildren(BaseProjectTreeBuilder.java:118)
at javax.swing.JTree.fireTreeExpanded(JTree.java:2774)
at javax.swing.JTree.setExpandedState(JTree.java:3625)
at javax.swing.JTree.expandPath(JTree.java:2211)
at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(BasicTreeUI.java:2286)
at javax.swing.plaf.basic.BasicTreeUI.handleExpandControlClick(BasicTreeUI.java:2273)
at javax.swing.plaf.basic.BasicTreeUI.checkForClickInExpandControl(BasicTreeUI.java:2231)
at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3600)
at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressedDND(BasicTreeUI.java:3586)
at com.intellij.util.ui.MouseEventAdapter.mousePressed(MouseEventAdapter.java:41)
at com.intellij.openapi.wm.impl.IdeGlassPaneImpl.a(IdeGlassPaneImpl.java:417)
at com.intellij.openapi.wm.impl.IdeGlassPaneImpl.dispatch(IdeGlassPaneImpl.java:198)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:603)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

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