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This exception has no message.
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via GitHub by bhartman2
, 2 years ago
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java.lang.NullPointerException: 	at javax.swing.ImageIcon.(Unknown Source)	at Sokoban.Wall.(Wall.java:15)	at Sokoban.Board.initWorld(Board.java:77)	at Sokoban.Board.(Board.java:44)	at Sokoban.Sokoban.InitUI(Sokoban.java:15)	at Sokoban.Sokoban.(Sokoban.java:11)	at Sokoban.Sokoban.main(Sokoban.java:28)