Minecraft Classic CTF help?

[Matthewd12]

lol ty for the link this is the error i get when players try to join

Code:

Jul 21, 2012 11:33:09 PM org.opencraft.server.task.TaskQueue$1 run
SEVERE: Error during task execution.
java.lang.NullPointerException
        at org.opencraft.server.task.impl.SessionClosedTask.execute(SessionClose
dTask.java:61)
        at org.opencraft.server.task.TaskQueue$1.run(TaskQueue.java:86)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:47
1)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
access$201(ScheduledThreadPoolExecutor.java:178)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
run(ScheduledThreadPoolExecutor.java:292)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.
java:1110)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
.java:603)
        at java.lang.Thread.run(Thread.java:722)