java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_101]
	at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_101]
	at net.minecraft.util.Util.runTask(Util.java:26) [Util.class:?]
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:740) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:685) [MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:155) [IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:534) [MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_101]
Caused by: java.lang.NullPointerException
	at greatblitz.testmod.server.GuiMessageHandler$1.run(GuiMessageHandler.java:22) ~[GuiMessageHandler$1.class:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_101]
	at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_101]
	at net.minecraft.util.Util.runTask(Util.java:25) ~[Util.class:?]
	... 5 more