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java.lang.NullPointerException: 	at java.applet.Applet.getCodeBase(Applet.java:136)	at undefined.ProvaLag_mlr.start(Mario.java:49)	at undefined.Mario.start(Mario.java:25)	at sun.applet.AppletPanel.run(AppletPanel.java:355)	at java.lang.Thread.run(Thread.java:536)