NPE when adding an editor to a project

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

         at jetbrains.mps.smodel.Language.getEditorFQName(Language.java:233)

         at

jetbrains.mps.smodel.Language.getEditorModelDescriptor(Language.java:

213)

         at

jetbrains.mps.smodel.Language.getEditorModelDescriptor(Language.java:

204)

         at

jetbrains.mps.smodel.Language.getLastChangeTime(Language.java:136)

         at jetbrains.mps.smodel.Language.isUpToDate(Language.java:128)

         at

jetbrains.mps.ide.projectPane.ProjectPane$ProjectLanguageTreeNode.toS

tring(ProjectPane.java:964)

         at javax.swing.JTree.convertValueToText(JTree.java:1139)

         at

javax.swing.tree.DefaultTreeCellRenderer.getTreeCellRendererComponent

(DefaultTreeCellRenderer.java:331)

         at

jetbrains.mps.ide.ui.MPSTree$1.getTreeCellRendererComponent(MPSTree.j

ava:30)

         at

javax.swing.plaf.basic.BasicTreeUI.paintRow(BasicTreeUI.java:1399)

         at javax.swing.plaf.basic.BasicTreeUI.paint(BasicTreeUI.java:1189)

         at javax.swing.plaf.metal.MetalTreeUI.paint(MetalTreeUI.java:152)

         at javax.swing.plaf.ComponentUI.update(ComponentUI.java:142)

         at javax.swing.JComponent.paintComponent(JComponent.java:740)

         at javax.swing.JComponent.paint(JComponent.java:1003)

         at jetbrains.mps.ide.ui.MPSTree.paint(MPSTree.java:123)

         at javax.swing.JComponent.paintChildren(JComponent.java:840)

         at javax.swing.JComponent.paint(JComponent.java:1012)

         at javax.swing.JViewport.paint(JViewport.java:728)

         at javax.swing.JComponent.paintChildren(JComponent.java:840)

         at javax.swing.JComponent.paint(JComponent.java:1012)

         at javax.swing.JComponent.paintChildren(JComponent.java:840)

         at javax.swing.JComponent.paint(JComponent.java:1012)

         at javax.swing.JComponent.paintChildren(JComponent.java:840)

         at javax.swing.JComponent.paint(JComponent.java:1012)

         at javax.swing.JComponent.paintChildren(JComponent.java:840)

         at javax.swing.JSplitPane.paintChildren(JSplitPane.java:1021)

         at javax.swing.JComponent.paint(JComponent.java:1012)

         at javax.swing.JComponent.paintChildren(JComponent.java:840)

         at javax.swing.JSplitPane.paintChildren(JSplitPane.java:1021)

         at javax.swing.JComponent.paint(JComponent.java:1012)

         at javax.swing.JComponent.paintChildren(JComponent.java:840)

         at javax.swing.JComponent.paint(JComponent.java:1012)

         at javax.swing.JComponent.paintChildren(JComponent.java:840)

         at javax.swing.JComponent.paint(JComponent.java:1012)

         at javax.swing.JLayeredPane.paint(JLayeredPane.java:559)

         at javax.swing.JComponent.paintChildren(JComponent.java:840)

         at

javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4937)

         at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4883)

         at javax.swing.JComponent.paint(JComponent.java:993)

         at

java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)

         at

sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:

60)

         at

sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97

)

         at java.awt.Container.paint(Container.java:1709)

         at sun.awt.RepaintArea.paintComponent(RepaintArea.java:248)

         at sun.awt.RepaintArea.paint(RepaintArea.java:224)

         at

sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:254)

         at java.awt.Component.dispatchEventImpl(Component.java:4031)

         at java.awt.Container.dispatchEventImpl(Container.java:2024)

         at java.awt.Window.dispatchEventImpl(Window.java:1766)

         at java.awt.Component.dispatchEvent(Component.java:3803)

         at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)

         at

java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh

read.java:234)

         at

java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre

ad.java:163)

         at

java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)

         at

java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)

         at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)