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

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java.lang.NullPointerException:
at com.esri.mo2.ui.bean.Layer.a(Layer.java)
at com.esri.mo2.ui.bean.Layer.getLayer(Layer.java)
at com.esri.mo2.ui.bean.Map.addImpl(Map.java)
at java.awt.Container.add(Container.java:351)
at undefined.QuickStart.addShapefileToMap(QuickStart.java:35)
at undefined.QuickStart.(QuickStart.java:28)
at undefined.QuickStart.main(QuickStart.java:39)

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