java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException: 	at sun.plugin2.applet.Plugin2Manager.findAppletJDKLevel(Unknown Source)	at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)	at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)