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java.lang.NullPointerException: 	at com.intellij.ui.content.impl.MessageViewImpl.getContentManager(MessageViewImpl.java:60)	at jetbrains.mps.ide.messages.MessagesViewTool$MyMessageList.updateHeader(MessagesViewTool.java:289)	at jetbrains.mps.ide.messages.MessageList$4.run(MessageList.java:185)	at jetbrains.mps.ide.ThreadUtils$LogExceptionsRunnable.run(ThreadUtils.java:84)	at jetbrains.mps.ide.ThreadUtils.runInUIThreadNoWait(ThreadUtils.java:61)	at jetbrains.mps.ide.messages.MessageList.clear(MessageList.java:172)	at jetbrains.mps.ide.messages.MessagesViewTool.newHandler(MessagesViewTool.java:166)	at jetbrains.mps.ide.make.DefaultMakeMessageHandler.(DefaultMakeMessageHandler.java:37)	at jetbrains.mps.ide.make.actions.MakeActionImpl.executeAction(MakeActionImpl.java:60)	at jetbrains.mps.ide.make.actions.RebuildProject_Action.doExecute(RebuildProject_Action.java:54)	at jetbrains.mps.workbench.action.BaseAction$2.run(BaseAction.java:145)	at jetbrains.mps.workbench.action.BaseAction.actionPerformed(BaseAction.java:155)	at com.intellij.openapi.actionSystem.ex.ActionUtil$1.run(ActionUtil.java:197)	at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:88)	at com.intellij.openapi.application.TransactionGuardImpl.submitTransactionAndWait(TransactionGuardImpl.java:156)	at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:211)	at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.lambda$actionPerformed$673(ActionMenuItem.java:304)	at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:905)	at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:124)	at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:284)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)	at com.intellij.openapi.actionSystem.impl.ActionMenuItem.lambda$fireActionPerformed$670(ActionMenuItem.java:112)	at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:88)	at com.intellij.openapi.application.TransactionGuardImpl.access$300(TransactionGuardImpl.java:40)	at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:113)	at com.intellij.openapi.application.TransactionGuardImpl.submitTransaction(TransactionGuardImpl.java:123)	at com.intellij.openapi.application.TransactionGuard.submitTransaction(TransactionGuard.java:109)	at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:112)	at com.intellij.ui.plaf.beg.BegMenuItemUI.doClick(BegMenuItemUI.java:513)	at com.intellij.ui.plaf.beg.BegMenuItemUI.access$300(BegMenuItemUI.java:45)	at com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:533)	at java.awt.Component.processMouseEvent(Component.java:6535)	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:4525)	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: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)