java.lang.RuntimeException: Error occured. Use undo to return to the last good state.
	at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.createLayout(SwingLayoutBuilder.java:137)
	at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.setupContainerLayout(SwingLayoutBuilder.java:73)
	at org.netbeans.modules.form.VisualReplicator.updateContainerLayout(VisualReplicator.java:257)
	at org.netbeans.modules.form.FormDesigner$FormListener.run(FormDesigner.java:1645)
	at org.netbeans.modules.form.FormDesigner$FormListener.formChanged(FormDesigner.java:1607)
	at org.netbeans.modules.form.FormModel.fireEvents(FormModel.java:919)
[catch] at org.netbeans.modules.form.FormModel$EventBroker.run(FormModel.java:1018)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Caused by: java.lang.IllegalStateException: javax.swing.JPanel[,155,116,332x236,invalid,layout=org.jdesktop.layout.GroupLayout,alignmentX=0.0,alignmentY=0.0,border=javax.swing.border.TitledBorder@166b697,flags=8,maximumSize=,minimumSize=,preferredSize=] is not attached to a vertical group
	at org.jdesktop.layout.GroupLayout.checkComponents(GroupLayout.java:823)
	at org.jdesktop.layout.GroupLayout.prepare(GroupLayout.java:801)
	at org.jdesktop.layout.GroupLayout.layoutContainer(GroupLayout.java:655)
	at org.netbeans.modules.form.layoutdesign.support.SwingLayoutBuilder.createLayout(SwingLayoutBuilder.java:127)
	... 13 more