java.lang.IllegalThreadStateException
	at java.lang.ThreadGroup.add(ThreadGroup.java:856)
	at java.lang.Thread.start(Thread.java:573)
	at java.lang.Shutdown.runHooks(Shutdown.java:128)
	at java.lang.Shutdown.sequence(Shutdown.java:173)
	at java.lang.Shutdown.exit(Shutdown.java:218)
	at java.lang.Runtime.exit(Runtime.java:90)
	at java.lang.System.exit(System.java:869)
	at sun.plugin.navig.motif.Plugin.doit(Plugin.java:178)
	at sun.plugin.navig.motif.Plugin.start(Plugin.java:104)