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

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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$600(ActionMenu.java:51)
at javax.swing.JMenu.fireMenuSelected(JMenu.java:1037)
at javax.swing.JMenu$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.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 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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