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java.lang.NoClassDefFoundError: 	at gps.connection.GPSRxTxPort.openPort(Unknown Source)	at gps.connection.GPSrxtx.myOpenPort(Unknown Source)	at gps.connection.GPSrxtx.setFreeTextPortAndOpen(Unknown Source)	at bt747.model.Controller.openFreeTextPort(Unknown Source)	at bt747.j2se_view.BT747Main.access$300$6e36da35(Unknown Source)	at bt747.j2se_view.BT747Main$7.actionPerformed(Unknown Source)