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

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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)

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