[12:38:58] [Server thread/ERROR] [minecraft/MinecraftServer]: Encountered an unexpected exception
java.util.ConcurrentModificationException: null
        at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:1013) ~[?:?] {}
        at java.util.ArrayList$Itr.next(ArrayList.java:967) ~[?:?] {}
        at com.google.common.collect.Iterators$1.next(Iterators.java:146) ~[guava-31.1-jre.jar%2374!/:?] {}
        at java.util.Iterator.forEachRemaining(Iterator.java:133) ~[?:?] {re:mixin}
        at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1845) ~[?:?] {}
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[?:?] {}
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?] {}
        at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[?:?] {}
        at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[?:?] {}
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?] {}
        at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) ~[?:?] {}
        at net.minecraft.world.level.entity.PersistentEntitySectionManager.m_157543_(PersistentEntitySectionManager.java:175) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:classloading,pl:accesstransformer:B}
        at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[?:?] {}
        at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) ~[?:?] {}
        at java.util.stream.LongPipeline$1$1.accept(LongPipeline.java:177) ~[?:?] {}
        at java.util.PrimitiveIterator$OfLong.forEachRemaining(PrimitiveIterator.java:183) ~[?:?] {}
        at java.util.Spliterators$LongIteratorSpliterator.forEachRemaining(Spliterators.java:2046) ~[?:?] {}
        at java.util.Spliterator$OfLong.forEachRemaining(Spliterator.java:775) ~[?:?] {}
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[?:?] {}
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?] {}
        at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[?:?] {}
        at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[?:?] {}
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?] {}
        at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) ~[?:?] {}
        at net.minecraft.world.level.entity.PersistentEntitySectionManager.m_157527_(PersistentEntitySectionManager.java:160) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:classloading,pl:accesstransformer:B}
        at net.minecraft.world.level.entity.PersistentEntitySectionManager.m_287207_(PersistentEntitySectionManager.java:146) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:classloading,pl:accesstransformer:B}
        at net.minecraft.server.level.ChunkMap.m_287285_(ChunkMap.java:1307) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:bugfix.paper_chunk_patches.ChunkMapMixin,pl:mixin:APP:modernfix-forge.mixins.json:bugfix.chunk_deadlock.ChunkMapLoadMixin,pl:mixin:APP:railways.mixins.json:ChunkMapAccessor,pl:mixin:APP:railways-common.mixins.json:conductor_possession.ChunkMapMixin,pl:mixin:A}
        at net.minecraft.server.level.ChunkHolder.m_287189_(ChunkHolder.java:346) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:mixin,re:classloading,pl:mixin:APP:modernfix-common.mixins.json:perf.ticking_chunk_alloc.ChunkHolderMixin,pl:mixin:A}
        at net.minecraft.server.level.ChunkHolder.m_143003_(ChunkHolder.java:416) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:mixin,re:classloading,pl:mixin:APP:modernfix-common.mixins.json:perf.ticking_chunk_alloc.ChunkHolderMixin,pl:mixin:A}
        at net.minecraft.server.level.DistanceManager.m_183906_(DistanceManager.java:120) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:mixin,re:classloading}
        at java.lang.Iterable.forEach(Iterable.java:75) ~[?:?] {re:mixin}
        at net.minecraft.server.level.DistanceManager.m_140805_(DistanceManager.java:119) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:mixin,re:classloading}
        at net.minecraft.server.level.ServerChunkCache.m_8489_(ServerChunkCache.java:273) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:cupboard.mixins.json:ChunkLoadDebug,pl:mixin:APP:modernfix-forge.mixins.json:bugfix.chunk_deadlock.ServerChunkCache_CurrentLoadingMixin,pl:mixin:A}
        at net.minecraft.server.level.ServerChunkCache$MainThreadExecutor.m_7245_(ServerChunkCache.java:545) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:classloading,pl:accesstransformer:B}
        at net.minecraft.server.level.ServerChunkCache.m_8466_(ServerChunkCache.java:269) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:cupboard.mixins.json:ChunkLoadDebug,pl:mixin:APP:modernfix-forge.mixins.json:bugfix.chunk_deadlock.ServerChunkCache_CurrentLoadingMixin,pl:mixin:A}
        at net.minecraft.server.MinecraftServer.m_129961_(MinecraftServer.java:758) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix_loop_spin_waiting.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:modernfix-forge.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:A}
        at net.minecraft.server.MinecraftServer.m_7245_(MinecraftServer.java:747) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix_loop_spin_waiting.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:modernfix-forge.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:A}
        at net.minecraft.util.thread.BlockableEventLoop.m_18701_(BlockableEventLoop.java:139) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
        at net.minecraft.server.MinecraftServer.mixinextras$bridge$m_18701_$241(MinecraftServer.java) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix_loop_spin_waiting.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:modernfix-forge.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:A}
        at net.minecraft.server.MinecraftServer.wrapOperation$zdf000$managedBlock(MinecraftServer.java:1856) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix_loop_spin_waiting.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:modernfix-forge.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:A}
        at net.minecraft.server.MinecraftServer.m_130012_(MinecraftServer.java:733) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix_loop_spin_waiting.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:modernfix-forge.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:A}
        at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:665) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix_loop_spin_waiting.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:modernfix-forge.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:A}
        at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:251) ~[server-1.20.1-20230612.114412-srg.jar%23213!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix_loop_spin_waiting.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:modernfix-forge.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:A}
        at java.lang.Thread.run(Thread.java:833) ~[?:?] {re:mixin}
[12:38:58] [Server thread/FATAL] [ne.mi.co.ForgeMod/]: Preparing crash report with UUID 371e590c-5db8-4661-b264-7c225daa5253
[12:38:58] [Server thread/ERROR] [minecraft/MinecraftServer]: This crash report has been saved to: /home/********/./crash-reports/crash-2025-07-17_12.38.58-server.txt