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Argument for @NotNull parameter 'node' of jetbrains/mps/ide/icons/IconManager.getIconFor must not be null
java.lang.IllegalArgumentException: Argument for @NotNull parameter 'node' of jetbrains/mps/ide/icons/IconManager.getIconFor must not be null	at jetbrains.mps.ide.icons.IconManager.getIconFor(IconManager.java)	at com.mbeddr.doc.aspect.ui.plugin.TabbedDocViewer_Tool.showDocumentation(TabbedDocViewer_Tool.java:190)	at com.mbeddr.doc.aspect.ui.plugin.DocumentationProjectPlugin_CustomProjectPlugin$1$1.run(DocumentationProjectPlugin_CustomProjectPlugin.java:51)	at jetbrains.mps.smodel.WorkbenchModelAccess$2.run(WorkbenchModelAccess.java:104)	at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:946)	at jetbrains.mps.smodel.WorkbenchModelAccess.runReadAction(WorkbenchModelAccess.java:99)	at com.mbeddr.doc.aspect.ui.plugin.DocumentationProjectPlugin_CustomProjectPlugin$1.selectionChangedTo(DocumentationProjectPlugin_CustomProjectPlugin.java:39)	at jetbrains.mps.nodeEditor.selection.SingularSelectionListenerAdapter.selectionChanged(SingularSelectionListenerAdapter.java:33)	at jetbrains.mps.nodeEditor.selection.SelectionManagerImpl.doChangeSelection(SelectionManagerImpl.java:214)	at jetbrains.mps.nodeEditor.selection.SelectionManagerImpl.setSelection(SelectionManagerImpl.java:114)	at jetbrains.mps.nodeEditor.selection.SelectionManagerImpl.setSelection(SelectionManagerImpl.java:88)	at jetbrains.mps.nodeEditor.EditorComponent.processCoordSelection(EditorComponent.java:2160)	at jetbrains.mps.nodeEditor.EditorComponent.processMousePressed(EditorComponent.java:2019)	at jetbrains.mps.nodeEditor.EditorComponent.access$1300(EditorComponent.java:218)	at jetbrains.mps.nodeEditor.EditorComponent$11.mousePressed(EditorComponent.java:529)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:279)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:279)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:279)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:279)	at java.awt.Component.processMouseEvent(Component.java:6532)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)	at java.awt.Component.processEvent(Component.java:6300)	at java.awt.Container.processEvent(Container.java:2236)	at java.awt.Component.dispatchEventImpl(Component.java:4891)	at java.awt.Container.dispatchEventImpl(Container.java:2294)	at java.awt.Component.dispatchEvent(Component.java:4713)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4522)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)	at java.awt.Container.dispatchEventImpl(Container.java:2280)	at java.awt.Window.dispatchEventImpl(Window.java:2750)	at java.awt.Component.dispatchEvent(Component.java:4713)	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$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)	at java.awt.EventQueue$4.run(EventQueue.java:731)	at java.awt.EventQueue$4.run(EventQueue.java:729)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:866)	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:650)	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:381)	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)