java.lang.IllegalArgumentException: illegal anchor value
   at java.awt.GridBagLayout.AdjustForGravity(GridBagLayout.java:1769)
   at java.awt.GridBagLayout.AdjustForGravity(GridBagLayout.java:1610)
   at java.awt.GridBagLayout.ArrangeGrid(GridBagLayout.java:2200)
   at java.awt.GridBagLayout.ArrangeGrid(GridBagLayout.java:2031)
   at java.awt.GridBagLayout.layoutContainer(GridBagLayout.java:812)
   at java.awt.Container.layout(Container.java:1508)
   at java.awt.Container.doLayout(Container.java:1497)
   at java.awt.Container.validateTree(Container.java:1693)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validate(Container.java:1628)
   at org.netbeans.core.windows.view.ui.DesktopImpl$LayeredLayout.layoutContainer(DesktopImpl.java:554)
   at java.awt.Container.layout(Container.java:1508)
   at java.awt.Container.doLayout(Container.java:1497)
   at java.awt.Container.validateTree(Container.java:1693)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validateTree(Container.java:1702)
   at java.awt.Container.validate(Container.java:1628)
   at javax.swing.RepaintManager$3.run(RepaintManager.java:704)
   at javax.swing.RepaintManager$3.run(RepaintManager.java:702)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:701)
   at org.netbeans.modules.form.FormDesigner.updateComponentLayer(FormDesigner.java:630)
   at org.netbeans.modules.form.FormDesigner.access$2200(FormDesigner.java:103)
   at org.netbeans.modules.form.FormDesigner$FormListener.run(FormDesigner.java:2698)
   at org.netbeans.modules.form.FormLAF$3.run(FormLAF.java:333)
   at org.openide.util.Mutex.doEventAccess(Mutex.java:1376)
   at org.openide.util.Mutex.readAccess(Mutex.java:278)
   at org.netbeans.modules.form.FormLAF.executeWithLookAndFeel(FormLAF.java:316)
   at org.netbeans.modules.form.FormDesigner$FormListener.processEvents(FormDesigner.java:2538)
   at org.netbeans.modules.form.FormDesigner$FormListener.formChanged(FormDesigner.java:2504)
   at org.netbeans.modules.form.FormModel.fireEvents(FormModel.java:1327)
   at org.netbeans.modules.form.FormModel.fireEventBatch(FormModel.java:1300)
   at org.netbeans.modules.form.FormModel.firePendingEvents(FormModel.java:1263)
   at org.netbeans.modules.form.FormModel.access$000(FormModel.java:68)
   at org.netbeans.modules.form.FormModel$2.run(FormModel.java:1240)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:749)
   at java.awt.EventQueue.access$500(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:702)
   at java.awt.EventQueue$3.run(EventQueue.java:696)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:719)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   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)