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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 net.trustx.simpleuml.plugin.configuration.ConfigurationFactory.saveToElement(ConfigurationFactory.java:104)	at net.trustx.simpleuml.plugin.UMLToolWindowPlugin.writeExternal(UMLToolWindowPlugin.java:499)	at com.intellij.openapi.components.impl.ComponentManagerImpl.serializeComponent(ComponentManagerImpl.java:204)	at com.intellij.openapi.project.impl.BaseFileConfigurable.saveToXml(BaseFileConfigurable.java:138)	at com.intellij.openapi.project.impl.ProjectImpl.saveToXml(ProjectImpl.java:28)	at com.intellij.openapi.project.impl.BaseFileConfigurable._save(BaseFileConfigurable.java:41)	at com.intellij.openapi.project.impl.ProjectImpl$2.run(ProjectImpl.java:9)	at com.intellij.openapi.command.impl.CommandProcessorImpl.executeCommand(CommandProcessorImpl.java:91)	at com.intellij.openapi.command.impl.CommandProcessorImpl.executeCommand(CommandProcessorImpl.java:58)	at com.intellij.openapi.project.impl.ProjectImpl.save(ProjectImpl.java:109)	at com.intellij.openapi.project.impl.ProjectManagerImpl.closeProject(ProjectManagerImpl.java:144)	at com.intellij.ide.impl.ProjectUtil.closeProject(ProjectUtil.java:20)	at com.intellij.ide.actions.CloseProjectAction.actionPerformed(CloseProjectAction.java:7)	at com.intellij.openapi.actionSystem.impl.ActionMenuItem$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)