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Context Environment

Minecraft version: 1.12.2

Ancient Warfare 2 version: 1.12.2-2.7.0.1032

Minecraft Forge version: 14.23.5.2854

Link to your crash log (if the game crashes):
[00:00:41] [Server thread/ERROR] [FML]: Exception caught during firing event net.minecraftforge.fml.common.gameevent.TickEvent$ServerTickEvent@215860b:
java.lang.NullPointerException: null
at net.shadowmage.ancientwarfare.structure.template.WorldGenStructureManager.lambda$selectTemplateForGeneration$3(WorldGenStructureManager.java:137) ~[WorldGenStructureManager.class:?]
at java.util.Collection.removeIf(Unknown Source) ~[?:1.8.0_281]
at net.shadowmage.ancientwarfare.structure.template.WorldGenStructureManager.selectTemplateForGeneration(WorldGenStructureManager.java:137) ~[WorldGenStructureManager.class:?]
at net.shadowmage.ancientwarfare.structure.worldgen.WorldStructureGenerator.lambda$generateAt$1(WorldStructureGenerator.java:77) ~[WorldStructureGenerator.class:?]
at java.util.Optional.ifPresent(Unknown Source) ~[?:1.8.0_281]
at net.shadowmage.ancientwarfare.structure.worldgen.WorldStructureGenerator.generateAt(WorldStructureGenerator.java:74) ~[WorldStructureGenerator.class:?]
at net.shadowmage.ancientwarfare.structure.worldgen.WorldGenTickHandler.genChunks(WorldGenTickHandler.java:79) ~[WorldGenTickHandler.class:?]
at net.shadowmage.ancientwarfare.structure.worldgen.WorldGenTickHandler.serverTick(WorldGenTickHandler.java:56) ~[WorldGenTickHandler.class:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_584_WorldGenTickHandler_serverTick_ServerTickEvent.invoke(.dynamic) ~[?:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) ~[ASMEventHandler.class:?]
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182) [EventBus.class:?]
at net.minecraftforge.fml.common.FMLCommonHandler.onPostServerTick(FMLCommonHandler.java:266) [FMLCommonHandler.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:712) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_281]
[00:00:41] [Server thread/ERROR] [FML]: Index: 10 Listeners:
[00:00:41] [Server thread/ERROR] [FML]: 0: NORMAL
[00:00:41] [Server thread/ERROR] [FML]: 1: ASM: class crazypants.enderio.base.teleport.ChunkTicket onServerTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 2: ASM: class crazypants.enderio.base.item.spawner.BrokenSpawnerHandler onServerTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 3: ASM: class crazypants.enderio.base.handler.ServerTickHandler onServerTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 4: ASM: class crazypants.enderio.base.init.TickTimer onTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 5: ASM: class crazypants.enderio.base.TileEntityEio onServerTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 6: ASM: class com.feed_the_beast.ftbutilities.handlers.FTBUtilitiesServerEventHandler onServerTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 7: ASM: class blusunrize.immersiveengineering.common.blocks.BlockIETileProvider onTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 8: ASM: net.minecraftforge.common.ForgeInternalHandler@6a4bbfc3 onServerTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 9: ASM: com.shinoow.abyssalcraft.common.handlers.AbyssalCraftEventHooks@55fd51ee onTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 10: ASM: net.shadowmage.ancientwarfare.structure.worldgen.WorldGenTickHandler@57081322 serverTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 11: ASM: class vazkii.patchouli.common.handler.AdvancementSyncHandler onTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 12: ASM: codechicken.enderstorage.network.TankSynchroniser@2f5e5df5 tickEnd(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 13: ASM: INSTANCE onServerTickEvent(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 14: ASM: com.enderio.core.common.util.Scheduler@2195efbf onServerTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 15: ASM: com.pg85.otg.forge.events.server.ServerTickHandler@298160f0 onServerTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 16: ASM: ru.socol.elderarsenal.ModListener@5baed64a onTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 17: ASM: li.cil.oc.common.EventHandler$@41edba2f onServerTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)Ljava/lang/Object;
[00:00:41] [Server thread/ERROR] [FML]: 18: ASM: li.cil.oc.common.asm.SimpleComponentTickHandler@47199a1f onTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 19: ASM: li.cil.oc.common.item.Tablet$@6dc29c57 onServerTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 20: ASM: openblocks.common.ServerTickHandler@69b38647 onServerTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 21: ASM: org.orecruncher.dsurround.server.services.ServiceManager@67b6a706 tickEvent(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 22: ASM: net.shadowmage.ancientwarfare.core.command.CommandUtils$ChunkLoadCommand$PlayerMover@7ae714c serverTick(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 23: ASM: Block{minecraft:air} tickEnd(Lnet/minecraftforge/fml/common/gameevent/TickEvent;)V
[00:00:41] [Server thread/ERROR] [FML]: 24: LOWEST
[00:00:41] [Server thread/ERROR] [FML]: 25: ASM: class codechicken.lib.internal.CCLLog onTickEnd(Lnet/minecraftforge/fml/common/gameevent/TickEvent$ServerTickEvent;)V
[00:00:41] [Server thread/ERROR] [minecraft/MinecraftServer]: Encountered an unexpected exception
java.lang.NullPointerException: null
at net.shadowmage.ancientwarfare.structure.template.WorldGenStructureManager.lambda$selectTemplateForGeneration$3(WorldGenStructureManager.java:137) ~[WorldGenStructureManager.class:?]
at java.util.Collection.removeIf(Unknown Source) ~[?:1.8.0_281]
at net.shadowmage.ancientwarfare.structure.template.WorldGenStructureManager.selectTemplateForGeneration(WorldGenStructureManager.java:137) ~[WorldGenStructureManager.class:?]
at net.shadowmage.ancientwarfare.structure.worldgen.WorldStructureGenerator.lambda$generateAt$1(WorldStructureGenerator.java:77) ~[WorldStructureGenerator.class:?]
at java.util.Optional.ifPresent(Unknown Source) ~[?:1.8.0_281]
at net.shadowmage.ancientwarfare.structure.worldgen.WorldStructureGenerator.generateAt(WorldStructureGenerator.java:74) ~[WorldStructureGenerator.class:?]
at net.shadowmage.ancientwarfare.structure.worldgen.WorldGenTickHandler.genChunks(WorldGenTickHandler.java:79) ~[WorldGenTickHandler.class:?]
at net.shadowmage.ancientwarfare.structure.worldgen.WorldGenTickHandler.serverTick(WorldGenTickHandler.java:56) ~[WorldGenTickHandler.class:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_584_WorldGenTickHandler_serverTick_ServerTickEvent.invoke(.dynamic) ~[?:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) ~[ASMEventHandler.class:?]
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182) ~[EventBus.class:?]
at net.minecraftforge.fml.common.FMLCommonHandler.onPostServerTick(FMLCommonHandler.java:266) ~[FMLCommonHandler.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:712) ~[MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_281]
[00:00:41] [Server thread/ERROR] [minecraft/MinecraftServer]: This crash report has been saved to: C:\Users\phili\Documents\Server\PVP - 1.12.2 - Saft.\crash-reports\crash-2021-02-23_00.00.41-server.txt

If you are using a modpack, link to the pack:
https://www.file-upload.net/download-14496015/ModsEntpackendundinmodsziehen.zip.html

Expected Behavior

The server should just generate a structure instead of crashing

Current Behavior

Crash

Steps to Reproduce

1. Start the Server
2. Fly around

Possible Solution

We need more information, because I am not going to download your modpack from that sketchy looking website where I can't even find the download button. Can you replicate this with just Ancient Warfare and CodeChickenLib? Which structures were you near when it crashed?

This is why we stress that OTG is incompatible. Neither of these crashes are an AW issue when you are using a world gen mod we specifically tell you not to use. You need to dump OTG and use AW2 - or Use OTG and find a different structure mod than AW2. There is no way around this, its either / or.

I also experienced a similar crash with my own custom modpack. I suspect it's because of OTG which is listed on the main page as incompatible. I added it for testing and using CTRL+F on OP's log, i see that he also has OTG.

Here's my crash report if I'm incorrect on the OTG incompatibility: https://pastebin.com/SuqZbpXJ