您好，
我得到了下面的错误信息，同时试图让一个刽子手应用程序。请帮我在这里。
Running in the identified_third_party security domain
java.lang.NullPointerException
at hangman_game.hangman_game.gamevariables(+14)
at hangman_game.hangman_game.process(+4)
at hangman_game.hangman_game.commandAction(+12)
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)