java.lang.NoClassDefFoundError: org/apache/regexp/RE: java/io/Serializable 
        at UltTra.commandAction(+25)
        at javax.microedition.lcdui.Display$DisplayAccessor.commandAction(+282)
        at javax.microedition.lcdui.Display$DisplayManagerImpl.commandAction(+10)
        at com.sun.midp.lcdui.DefaultEventHandler.commandEvent(+68)
        at com.sun.midp.lcdui.AutomatedEventHandler.commandEvent(+47)
        at com.sun.midp.lcdui.DefaultEventHandler$QueuedEventHandler.handleVmEvent(+186)
        at com.sun.midp.lcdui.DefaultEventHandler$QueuedEventHandler.run(+57)