Scheduler Warning

Hello Everyboady,
I have a problem with my Survivalgames plugin. When I start my Server, everything ist ok, bute whne somone joins the Server there ist ab big error in the console:
[17:30:29 WARN]: Exception in thread "Craft Scheduler Thread - 56"
[17:30:29 WARN]: org.apache.commons.lang.UnhandledException: Plugin SurvivalGames v1.0 generated an exception while executing task 9
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at de.nameddaniel.sg.main.Main$1.run(Main.java:116)
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71)
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
... 3 more

I do not know what this Error means.
Please help me as fast as possible.

Your NamedDaniel