Timerhelp

Hi I need help with a timer.
My problem is the timer when I always get this fault code:

Code:

Exception in thread "Timer-0" java.lang.NullPointerException
        at com.bukkit.KingGenius.ServerSecurityBukkit.timer$automsg.run(timer.ja
va:48)
        at java.util.TimerThread.mainLoop(Unknown Source)
        at java.util.TimerThread.run(Unknown Source)

This comes and I work with players.

Here, the timer code:

Code:

    private class automsg   extends TimerTask
        {
        public void run()
          {
            //System.out.println(veriablen.getAuto_MSGData(2));
            plugin.getServer().broadcastMessage("test");
            }
          }

I hope someone can help me.

Sincerely rene3233