java.lang.IllegalStateException
	at org.openide.util.Mutex.leaveImpl(Mutex.java:756)
	at org.openide.util.Mutex.leave(Mutex.java:741)
	at org.openide.util.Mutex.access$200(Mutex.java:82)
	at org.openide.util.Mutex$Privileged.exitReadAccess(Mutex.java:1498)
	at org.openide.nodes.Children.getNodes(Children.java:371)
	at org.netbeans.modules.autoupdate.UpdatePanel$12.run(UpdatePanel.java:1073)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:541)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:963)