java.lang.NoClassDefFoundError: Could not initialize class org.netbeans.api.project.ui.OpenProjects
   at org.netbeans.modules.project.ui.ProjectTab.<init>(ProjectTab.java:207)
   at org.netbeans.modules.project.ui.ProjectTab.<init>(ProjectTab.java:182)
   at org.netbeans.modules.project.ui.ProjectTab.getDefault(ProjectTab.java:332)
   at org.netbeans.modules.project.ui.ProjectTab.findDefault(ProjectTab.java:318)
   at org.netbeans.modules.project.ui.ProjectTabAction.actionPerformed(ProjectTabAction.java:92)
   at org.openide.awt.AlwaysEnabledAction$1.run(AlwaysEnabledAction.java:199)
   at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:95)
   at org.openide.util.actions.ActionInvoker.doPerformAction(ActionInvoker.java:116)
   at org.openide.util.actions.ActionInvoker.invokeAction(ActionInvoker.java:99)
   at org.openide.awt.AlwaysEnabledAction.actionPerformed(AlwaysEnabledAction.java:202)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:0)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:0)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:0)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:0)
   at javax.swing.AbstractButton.doClick(AbstractButton.java:0)
   at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:0)
   at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:0)
   at java.awt.Component.processMouseEvent(Component.java:0)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:0)
   at java.awt.Component.processEvent(Component.java:0)
   at java.awt.Container.processEvent(Container.java:0)
   at java.awt.Component.dispatchEventImpl(Component.java:0)
   at java.awt.Container.dispatchEventImpl(Container.java:0)
   at java.awt.Component.dispatchEvent(Component.java:0)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:0)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:0)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:0)
   at java.awt.Container.dispatchEventImpl(Container.java:0)
   at java.awt.Window.dispatchEventImpl(Window.java:0)
   at java.awt.Component.dispatchEvent(Component.java:0)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:0)
   at java.awt.EventQueue.access$200(EventQueue.java:0)
   at java.awt.EventQueue$3.run(EventQueue.java:0)
   at java.awt.EventQueue$3.run(EventQueue.java:0)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:0)
   at java.awt.EventQueue$4.run(EventQueue.java:0)
   at java.awt.EventQueue$4.run(EventQueue.java:0)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:0)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:0)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:0)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:0)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:0)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:0)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:0)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:0)