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java.lang.Throwable: 	at com.intellij.openapi.diagnostic.Logger.assertTrue(Logger.java:144)	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 com.intellij.ide.util.treeView.AbstractTreeUi$MyExpansionListener.treeExpanded(AbstractTreeUi.java:4817)	at javax.swing.JTree.fireTreeExpanded(JTree.java:2774)	at javax.swing.JTree.setExpandedState(JTree.java:3625)	at javax.swing.JTree.expandPath(JTree.java:2211)	at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(BasicTreeUI.java:2286)	at javax.swing.plaf.basic.BasicTreeUI.handleExpandControlClick(BasicTreeUI.java:2273)	at javax.swing.plaf.basic.BasicTreeUI.checkForClickInExpandControl(BasicTreeUI.java:2231)	at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3600)	at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressedDND(BasicTreeUI.java:3586)	at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(BasicTreeUI.java:3545)	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 com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:380)	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)