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java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:386)	at java.util.Properties.setProperty(Properties.java:102)	at DYC.dycapp.setupYieldGraph(dycapp.java:195)	at DYC.dycapp.jbInit(dycapp.java:134)	at DYC.dycapp.init(dycapp.java:58)	at sun.applet.AppletPanel.run(AppletPanel.java:341)	at java.lang.Thread.run(Thread.java:536)