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org.jdom.Element.addContent(Lorg/jdom/Element;)Lorg/jdom/Element;
java.lang.NoSuchMethodError: 
org.jdom.Element.addContent(Lorg/jdom/Element;)Lorg/jdom/Element;	at org.intellij.openapi.util.externalizer.JDOMExternalizer.writeExternal(JDOMExternalizer.java:22)	at org.intellij.openapi.components.ExternalizableApplicationComponent.writeExternal(ExternalizableApplicationComponent.java:15)	at com.intellij.openapi.components.impl.ComponentManagerImpl.serializeComponent(ComponentManagerImpl.java:204)	at com.intellij.openapi.application.impl.ApplicationImpl.b(ApplicationImpl.java:75)	at com.intellij.openapi.application.impl.ApplicationImpl.saveSettings(ApplicationImpl.java:72)	at com.intellij.openapi.project.impl.ProjectManagerImpl.closeProject(ProjectManagerImpl.java:30)	at com.intellij.ide.impl.ProjectUtil.closeProject(ProjectUtil.java:20)	at com.intellij.ide.actions.CloseProjectAction.actionPerformed(CloseProjectAction.java:7)	at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:14)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1819)	at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:47)	at com.intellij.ui.plaf.beg.BegMenuItemUI.a(BegMenuItemUI.java:129)	at com.intellij.ui.plaf.beg.BegMenuItemUI.access$300(BegMenuItemUI.java:100)	at com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:8)	at java.awt.Component.processMouseEvent(Component.java:5166)	at java.awt.Component.processEvent(Component.java:4963)	at java.awt.Container.processEvent(Container.java:1613)	at java.awt.Component.dispatchEventImpl(Component.java:3681)	at java.awt.Container.dispatchEventImpl(Container.java:1671)	at java.awt.Component.dispatchEvent(Component.java:3543)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3527)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3242)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3172)	at java.awt.Container.dispatchEventImpl(Container.java:1657)	at java.awt.Window.dispatchEventImpl(Window.java:1606)	at java.awt.Component.dispatchEvent(Component.java:3543)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:111)	at com.intellij.ide.IdeEventQueue.a(IdeEventQueue.java:64)	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:119)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:184)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:178)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:170)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)