java.lang.IllegalArgumentException: Sections overlap
   at org.netbeans.modules.editor.guards.GuardedSectionsImpl.checkOverlap(GuardedSectionsImpl.java:316)
   at org.netbeans.modules.editor.guards.GuardedSectionsImpl.checkNewSection(GuardedSectionsImpl.java:305)
   at org.netbeans.modules.editor.guards.GuardedSectionsImpl.createInteriorSection(GuardedSectionsImpl.java:168)
   at org.netbeans.api.editor.guards.GuardedSectionManager.createInteriorSection(GuardedSectionManager.java:128)
   at org.netbeans.modules.form.JavaCodeGenerator.insertEvendHandlerSection(JavaCodeGenerator.java:3368)
   at org.netbeans.modules.form.JavaCodeGenerator.generateEventHandler(JavaCodeGenerator.java:3147)
   at org.netbeans.modules.form.JavaCodeGenerator.access$1400(JavaCodeGenerator.java:91)
   at org.netbeans.modules.form.JavaCodeGenerator$FormListener.formChanged(JavaCodeGenerator.java:3963)
   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:251)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
   at java.awt.EventQueue.access$200(EventQueue.java:103)
   at java.awt.EventQueue$3.run(EventQueue.java:694)
   at java.awt.EventQueue$3.run(EventQueue.java:692)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)