java.lang.IllegalStateException: The combo-box must be empty.
        at org.netbeans.modules.bugtracking.util.RepositoryComboSupport.checkOldComboBoxModel(RepositoryComboSupport.java:196)
        at org.netbeans.modules.bugtracking.util.RepositoryComboSupport.<init>(RepositoryComboSupport.java:179)
        at org.netbeans.modules.bugtracking.util.RepositoryComboSupport.setup(RepositoryComboSupport.java:164)
        at org.netbeans.modules.bugtracking.bridge.exportdiff.AttachPanel.init(AttachPanel.java:72)
        at org.netbeans.modules.bugtracking.bridge.exportdiff.AttachIssueProvider.createComponent(AttachIssueProvider.java:99)
        at org.netbeans.modules.versioning.util.ExportDiffSupport.initializePanels(ExportDiffSupport.java:125)
        at org.netbeans.modules.versioning.util.ExportDiffSupport.export(ExportDiffSupport.java:173)
        at org.netbeans.modules.subversion.ui.diff.ExportDiffAction.performContextAction(ExportDiffAction.java:161)
        at org.netbeans.modules.subversion.ui.actions.ContextAction.performAction(ContextAction.java:113)
        at org.openide.util.actions.NodeAction.performAction(NodeAction.java:296)
        at org.netbeans.modules.subversion.ui.actions.ContextAction.performAction(ContextAction.java:144)
        at org.openide.util.actions.CallableSystemAction$1.run(CallableSystemAction.java:127)
        at org.netbeans.modules.openide.util.ActionsBridge.implPerformAction(ActionsBridge.java:83)
        at org.netbeans.modules.openide.util.ActionsBridge.doPerformAction(ActionsBridge.java:64)
        at org.openide.util.actions.CallableSystemAction.actionPerformed(CallableSystemAction.java:123)
        at org.openide.util.actions.NodeAction.actionPerformed(NodeAction.java:284)
        at org.netbeans.modules.subversion.ui.actions.ContextAction.actionPerformed(ContextAction.java:139)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1882)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2202)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:334)
        at apple.laf.ScreenMenuItem.actionPerformed(ScreenMenuItem.java:95)
        at java.awt.MenuItem.processActionEvent(MenuItem.java:597)
        at java.awt.MenuItem.processEvent(MenuItem.java:556)
        at java.awt.MenuComponent.dispatchEventImpl(MenuComponent.java:298)
        at java.awt.MenuComponent.dispatchEvent(MenuComponent.java:286)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:466)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:117)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)