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java.lang.NullPointerException: 	at com.intellij.codeInsight.hint.actions.ShowImplementationsAction.getElement(ShowImplementationsAction.java:189)	at com.intellij.codeInsight.hint.actions.ShowImplementationsAction.update(ShowImplementationsAction.java:99)	at com.intellij.openapi.actionSystem.ex.ActionUtil.performDumbAwareUpdate(ActionUtil.java:123)	at com.intellij.openapi.actionSystem.impl.Utils.doUpdate(Utils.java:188)	at com.intellij.openapi.actionSystem.impl.Utils.updateGroupChild(Utils.java:265)	at com.intellij.openapi.actionSystem.impl.Utils.hasChildrenWithState(Utils.java:239)	at com.intellij.openapi.actionSystem.impl.Utils.hasEnabledChildren(Utils.java:209)	at com.intellij.openapi.actionSystem.impl.Utils.expandActionGroup(Utils.java:147)	at com.intellij.openapi.actionSystem.impl.Utils.expandActionGroup(Utils.java:86)	at com.intellij.openapi.actionSystem.impl.Utils.fillMenu(Utils.java:280)	at com.intellij.openapi.actionSystem.impl.ActionMenu.fillMenu(ActionMenu.java:324)	at com.intellij.openapi.actionSystem.impl.ActionMenu.access$600(ActionMenu.java:51)	at com.intellij.openapi.actionSystem.impl.ActionMenu$MenuListenerImpl.menuSelected(ActionMenu.java:278)	at javax.swing.JMenu.fireMenuSelected(JMenu.java:1037)	at javax.swing.JMenu$MenuChangeListener.stateChanged(JMenu.java:1117)	at javax.swing.DefaultButtonModel.fireStateChanged(DefaultButtonModel.java:349)	at javax.swing.DefaultButtonModel.setSelected(DefaultButtonModel.java:232)	at javax.swing.JMenu.setSelected(JMenu.java:305)	at javax.swing.JMenu.menuSelectionChanged(JMenu.java:1186)	at com.intellij.openapi.actionSystem.impl.ActionMenu.menuSelectionChanged(ActionMenu.java:240)	at javax.swing.MenuSelectionManager.setSelectedPath(MenuSelectionManager.java:125)	at javax.swing.plaf.basic.BasicMenuUI$Handler.mouseEntered(BasicMenuUI.java:526)	at java.awt.Component.processMouseEvent(Component.java:6534)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)	at java.awt.Component.processEvent(Component.java:6290)	at java.awt.Container.processEvent(Container.java:2234)	at java.awt.Component.dispatchEventImpl(Component.java:4881)	at java.awt.Container.dispatchEventImpl(Container.java:2292)	at java.awt.Component.dispatchEvent(Component.java:4703)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898)	at java.awt.LightweightDispatcher.retargetMouseEnterExit(Container.java:4686)	at java.awt.LightweightDispatcher.trackMouseEnterExit(Container.java:4665)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4514)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462)	at java.awt.Container.dispatchEventImpl(Container.java:2278)	at java.awt.Window.dispatchEventImpl(Window.java:2750)	at java.awt.Component.dispatchEvent(Component.java:4703)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)	at java.awt.EventQueue.access$500(EventQueue.java:97)	at java.awt.EventQueue$3.run(EventQueue.java:709)	at java.awt.EventQueue$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)	at java.awt.EventQueue$4.run(EventQueue.java:731)	at java.awt.EventQueue$4.run(EventQueue.java:729)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:863)	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:695)	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:385)	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)