java.lang.NoClassDefFoundError: com/pstreets/gisengine/demo/midp/HelloWorldMIDP: com/mapdigit/gis/raster/IReaderListener
at com.sun.midp.midlet.MIDletState.createMIDlet(+29)
at com.sun.midp.midlet.Scheduler.schedule(+52)
at com.sun.midp.main.Main.runLocalClass(+28)
at com.sun.midp.main.Main.main(+80)
高手给指教一下啊。