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Build: NetBeans IDE Dev (Build 200803021202) VM: Java HotSpot(TM) Client VM, 10.0-b19 OS: Windows XP, 5.1, x86 User Comments: I add detailed description when I reproduce it again.
Created attachment 57661 [details] stacktrace
StackTrace: =========== java.lang.NullPointerException at org.netbeans.modules.form.RADVisualContainer.getContainerDelegate(RADVisualContainer.java:174) at org.netbeans.modules.form.actions.SelectLayoutAction.convertToNewLayout(SelectLayoutAction.java:259) at org.netbeans.modules.form.actions.SelectLayoutAction.access$400(SelectLayoutAction.java:69) at org.netbeans.modules.form.actions.SelectLayoutAction$LayoutActionListener.actionPerformed(SelectLayoutAction.java:246) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
I am sorry, I am not able to reproduce this issue and the attached exception is not enough to track the problem down. Please, provide more details. It would be ideal to describe exact steps to reproduce.
No additional information provided => closing as non-reproducible.