java.lang.AssertionError
   at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.fillGroup(SwingLayoutBuilder.java:308)
   at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.composeGroup(SwingLayoutBuilder.java:238)
   at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.fillGroup(SwingLayoutBuilder.java:266)
   at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.composeGroup(SwingLayoutBuilder.java:238)
   at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.fillGroup(SwingLayoutBuilder.java:257)
   at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.composeGroup(SwingLayoutBuilder.java:238)
   at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.fillGroup(SwingLayoutBuilder.java:266)
   at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.composeGroup(SwingLayoutBuilder.java:238)
   at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.fillGroup(SwingLayoutBuilder.java:257)
   at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.composeGroup(SwingLayoutBuilder.java:238)
   at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.fillGroup(SwingLayoutBuilder.java:266)
   at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.composeGroup(SwingLayoutBuilder.java:238)
   at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.createLayout(SwingLayoutBuilder.java:179)
   at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.setupContainerLayout(SwingLayoutBuilder.java:108)
   at org.netbeans.modules.form.VisualReplicator.setupContainerLayout(VisualReplicator.java:814)
   at org.netbeans.modules.form.VisualReplicator.updateContainerLayout(VisualReplicator.java:324)
   at org.netbeans.modules.form.FormDesigner$LayoutMapper.rebuildLayout(FormDesigner.java:2265)
   at org.netbeans.modules.form.layoutdesign.LayoutDesigner.rebuildLayoutRecursively(LayoutDesigner.java:226)
   at org.netbeans.modules.form.layoutdesign.LayoutDesigner.updateCurrentState(LayoutDesigner.java:205)
   at org.netbeans.modules.form.FormDesigner.updateComponentLayer(FormDesigner.java:641)
   at org.netbeans.modules.form.FormDesigner.access$2100(FormDesigner.java:102)
   at org.netbeans.modules.form.FormDesigner$FormListener.run(FormDesigner.java:2615)
   at org.netbeans.modules.form.FormDesigner$FormListener.processEvents(FormDesigner.java:2475)
   at org.netbeans.modules.form.FormDesigner$FormListener.formChanged(FormDesigner.java:2434)
   at org.netbeans.modules.form.FormModel.fireEvents(FormModel.java:1322)
   at org.netbeans.modules.form.FormModel.fireEventBatch(FormModel.java:1295)
   at org.netbeans.modules.form.FormModel.firePendingEvents(FormModel.java:1258)
   at org.netbeans.modules.form.FormModel.access$000(FormModel.java:68)
   at org.netbeans.modules.form.FormModel$2.run(FormModel.java:1238)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:701)
   at java.awt.EventQueue.access$000(EventQueue.java:102)
   at java.awt.EventQueue$3.run(EventQueue.java:662)
   at java.awt.EventQueue$3.run(EventQueue.java:660)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:671)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:158)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)