---- Minecraft Crash Report ----
// I just don't know what went wrong :(

Time: 2018-07-17 23:04:13 CDT
Description: Exception in server tick loop

java.lang.NullPointerException
at net.shadowmage.ancientwarfare.structure.town.TownTemplateManager.getTemplatesValidAtPosition(TownTemplateManager.java:43)
at net.shadowmage.ancientwarfare.structure.town.WorldTownGenerator.attemptGeneration(WorldTownGenerator.java:40)
at net.shadowmage.ancientwarfare.structure.world_gen.WorldGenTickHandler.genTowns(WorldGenTickHandler.java:80)
at net.shadowmage.ancientwarfare.structure.world_gen.WorldGenTickHandler.serverTick(WorldGenTickHandler.java:50)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_1043_WorldGenTickHandler_serverTick_ServerTickEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
at net.minecraftforge.fml.common.FMLCommonHandler.onPostServerTick(FMLCommonHandler.java:265)
at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:712)
at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:252)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
at java.lang.Thread.run(Thread.java:745)

What version of AW are you using?

ancientwarfare-1.12.2-2.6.1.285.jar

Looks like I had the same problem -
https://paste.fedoraproject.org/paste/6l5~nt9P5EO0xH-U1F0yXg