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Explanation

The server modification “Industrial Craft 2” tries to integrate custom content, like scary mob skins into the game every year around Halloween (starting at the 30th of October). The named modification is used for many Feed the Beast, Technik and DNS Modpacks. Unfortunately, the custom mod skins Industrial Craft 2 tries to load are corrupted and cause a crash of the whole Gameserver as soon as a player tries to join. The corresponding crash dumps can be found in the server’s crash-dump folder via the “Filebrowser”. The crash dumps should look like this:

Description: Exception ticking world java.lang.RuntimeException: java.lang.NullPointerException at ic2.core.IC2.onLivingSpecialSpawn(IC2.java:2270) at net.minecraftforge.event.ASMEventHandler_28_IC2_onLivingSpecialSpawn_LivingSpecialSpawnEvent.invoke(.dynamic) at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:35) at net.minecraftforge.event.EventBus.post(EventBus.java:103) at net.minecraftforge.event.ForgeEventFactory.doSpecialSpawn(ForgeEventFactory.java:52) at yp.a(SpawnerAnimals.java:245) at yp.a(SpawnerAnimals.java:187) at in.b(WorldServer.java:162) at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:669) at ho.r(DedicatedServer.java:269) at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:599) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497) at fy.run(SourceFile:849) Caused by: java.lang.NullPointerException at ic2.core.IC2.onLivingSpecialSpawn(IC2.java:2268) … 12 more

Solution

The following steps are necessary to resolve the Halloween bug on a Gameserver:

• Stop the server
• Open the server.properties file by using the “Filebrowser” option in the server’s Webinterface (Tools -> Filebrowser)
• Adjust the setting difficulty to 0 :

• Adjust the setting spawn-monsters to false :

• Save the server.properties file
• Restart the Gameserver

After Halloween’s over, mobs can be enabled again.

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