Now I'm using Mohist server. When I throw the eye,it just do nothing. When use /locate betterstrongholds it wrongs, and my server says:
[00:30:44 WARN]: java.lang.NullPointerException [00:30:44 WARN]: at net.minecraft.world.gen.ChunkGenerator.func_235956_a_(ChunkGenerator.java:177) [00:30:44 WARN]: at com.telepathicgrunt.repurposedstructures.utils.StructureLocator.returnClosestStronghold(StructureLocator.java:19) [00:30:44 WARN]: at net.minecraft.item.EnderEyeItem.localvar$zzb000$repurposedstructures_locateRSStrongholds(EnderEyeItem.java:521) [00:30:44 WARN]: at net.minecraft.item.EnderEyeItem.func_77659_a(EnderEyeItem.java:92) [00:30:44 WARN]: at net.minecraft.item.ItemStack.func_77957_a(ItemStack.java:247) [00:30:44 WARN]: at net.minecraft.server.management.PlayerInteractionManager.func_187250_a(PlayerInteractionManager.java:352) [00:30:44 WARN]: at net.minecraft.network.play.ServerPlayNetHandler.func_147346_a(ServerPlayNetHandler.java:1486) [00:30:44 WARN]: at net.minecraft.network.play.client.CPlayerTryUseItemPacket.func_148833_a(CPlayerTryUseItemPacket.java:30) [00:30:44 WARN]: at net.minecraft.network.play.client.CPlayerTryUseItemPacket.func_148833_a(CPlayerTryUseItemPacket.java:9) [00:30:44 WARN]: at net.minecraft.network.PacketThreadUtil.func_225383_a(PacketThreadUtil.java:22) [00:30:44 WARN]: at net.minecraft.util.concurrent.TickDelayedTask.run(SourceFile:18) [00:30:44 WARN]: at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213166_h(ThreadTaskExecutor.java:136) [00:30:44 WARN]: at net.minecraft.util.concurrent.RecursiveEventLoop.func_213166_h(SourceFile:23) [00:30:44 WARN]: at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:868) [00:30:44 WARN]: at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:178) [00:30:44 WARN]: at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213168_p(ThreadTaskExecutor.java:109) [00:30:44 WARN]: at net.minecraft.server.MinecraftServer.func_213205_aW(MinecraftServer.java:851) [00:30:44 WARN]: at net.minecraft.server.MinecraftServer.func_213168_p(MinecraftServer.java:845) [00:30:44 WARN]: at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213161_c(ThreadTaskExecutor.java:119) [00:30:44 WARN]: at net.minecraft.server.MinecraftServer.func_213202_o(MinecraftServer.java:831) [00:30:44 WARN]: at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:763) [00:30:44 WARN]: at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:271) [00:30:44 WARN]: at java.lang.Thread.run(Unknown Source)

00:30:44 WARN: at net.minecraft.world.gen.ChunkGenerator.func_235956_a_(ChunkGenerator.java:177)
00:30:44 WARN: at com.telepathicgrunt.repurposedstructures.utils.StructureLocator.returnClosestStronghold(StructureLocator.java:19)
00:30:44 WARN: at net.minecraft.item.EnderEyeItem.localvar$zzb000$repurposedstructures_locateRSStrongholds(EnderEyeItem.java:521)
00:30:44 WARN: at net.minecraft.item.EnderEyeItem.func_77659_a(EnderEyeItem.java:92)
00:30:44 WARN: at net.minecraft.item.ItemStack.func_77957_a(ItemStack.java:247)
00:30:44 WARN: at net.minecraft.server.management.PlayerInteractionManager.func_187250_a(PlayerInteractionManager.java:352)
00:30:44 WARN: at net.minecraft.network.play.ServerPlayNetHandler.func_147346_a(ServerPlayNetHandler.java:1486)
00:30:44 WARN: at net.minecraft.network.play.client.CPlayerTryUseItemPacket.func_148833_a(CPlayerTryUseItemPacket.java:30)
00:30:44 WARN: at net.minecraft.network.play.client.CPlayerTryUseItemPacket.func_148833_a(CPlayerTryUseItemPacket.java:9)
00:30:44 WARN: at net.minecraft.network.PacketThreadUtil.func_225383_a(PacketThreadUtil.java:22)
00:30:44 WARN: at net.minecraft.util.concurrent.TickDelayedTask.run(SourceFile:18)
00:30:44 WARN: at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213166_h(ThreadTaskExecutor.java:136)
00:30:44 WARN: at net.minecraft.util.concurrent.RecursiveEventLoop.func_213166_h(SourceFile:23)
00:30:44 WARN: at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:868)
00:30:44 WARN: at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:178)
00:30:44 WARN: at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213168_p(ThreadTaskExecutor.java:109)
00:30:44 WARN: at net.minecraft.server.MinecraftServer.func_213205_aW(MinecraftServer.java:851)
00:30:44 WARN: at net.minecraft.server.MinecraftServer.func_213168_p(MinecraftServer.java:845)
00:30:44 WARN: at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213161_c(ThreadTaskExecutor.java:119)
00:30:44 WARN: at net.minecraft.server.MinecraftServer.func_213202_o(MinecraftServer.java:831)
00:30:44 WARN: at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:763)
00:30:44 WARN: at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:271)
00:30:44 WARN: at java.lang.Thread.run(Unknown Source)

Make sure you have the latest version of both Better Strongholds and Repurposed Structures

Make sure you have the latest version of both Better Strongholds and Repurposed Structures

yes my server use Repurposed Structures 2.7.5 and BetterStrongholds-1.16.4-1.1, it's latest version.
Single player game do not have this problem, '/locate betterstrongholds' and Ender_eye works

Can you pastebin the full crashlog and latest.log?

@chemhell This should've been on my repurposed structures github lol. But anyway, looking at the code on just forge, I dont see how this crash is at all possible unless mohist changed the Chunkgenerator.findNearestMapFeature method and removed the null check or something. I think this is a Mohist issue as they are known for missing lots of forge implementations and doing invasive changes that breaks mods. If you take your modpack and put it on a Forge only world locally, does the locate command and eye work? If so, then yeah, it's a Mohist issue that's outside my control

你能粘贴完整的崩溃日志和最新的.log吗？

Server did not crash, i just can't use the ender_eye.

@chemhell This should've been on my repurposed structures github lol. But anyway, looking at the code on just forge, I dont see how this crash is at all possible unless mohist changed the Chunkgenerator.findNearestMapFeature method and removed the null check or something. I think this is a Mohist issue as they are known for missing lots of forge implementations and doing invasive changes that breaks mods. If you take your modpack and put it on a Forge only world locally, does the locate command and eye work? If so, then yeah, it's a Mohist issue that's outside my control

oh, maybe, I'll cheke in forgeserver

Yeah, this is a problem with Mohist. Unfortunately we can't really help you there. I recommend not using Mohist if at all possible. They are notorious for making breaking changes that can cause a lot of problems.