---- Minecraft Crash Report ----

WARNING: coremods are present:
llibrary (llibrary-core-1.0.11-1.12.2.jar)
Contact their authors BEFORE contacting forge

// I bet Cylons wouldn't have this problem.

Time: 1/9/21 1:30 PM
Description: Exception in server tick loop

java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
at net.minecraft.entity.EntityTracker.func_72788_a(EntityTracker.java:290)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:779)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:185)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:

-- System Details --
Details:
Minecraft Version: 1.12.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1024750648 bytes (977 MB) / 1946157056 bytes (1856 MB) up to 2147483648 bytes (2048 MB)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
IntCache: cache: 0, tcache: 8, allocated: 20, tallocated: 86
FML: MCP 9.42 Powered by Forge 14.23.5.2854 12 mods loaded, 12 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

| State  | ID           | Version      | Source                          | Signature                                |
|:------ |:------------ |:------------ |:------------------------------- |:---------------------------------------- |
| LCHIJA | minecraft    | 1.12.2       | minecraft.jar                   | None                                     |
| LCHIJA | mcp          | 9.42         | minecraft.jar                   | None                                     |
| LCHIJA | FML          | 8.0.99.99    | forge-1.12.2-14.23.5.2854.jar   | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCHIJA | forge        | 14.23.5.2854 | forge-1.12.2-14.23.5.2854.jar   | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCHIJA | backpack     | 3.0.2        | backpack-3.0.2-1.12.2.jar       | None                                     |
| LCHIJA | llibrary     | 1.7.20       | llibrary-1.7.20-1.12.2.jar      | b9f30a813bee3b9dd5652c460310cfcd54f6b7ec |
| LCHIJA | fossil       | 8.0.4        | fossilsarcheology-8.0.4.jar     | None                                     |
| LCHIJA | jei          | 4.16.1.301   | jei_1.12.2-4.16.1.301.jar       | None                                     |
| LCHIJA | journeymap   | 1.12.2-5.7.1 | journeymap-1.12.2-5.7.1.jar     | None                                     |
| LCHIJA | harvestcraft | 1.12.2zb     | Pam's+HarvestCraft+1.12.2zg.jar | None                                     |
| LCHIJA | timberjack   | 1.6          | Timberjack_1.12.2-1.6.jar       | None                                     |
| LCHIJA | jurassicraft | 2.1.23       | JurassiCraft-1.12.2-2.1.23.jar  | None                                     |

Loaded coremods (and transformers): 

llibrary (llibrary-core-1.0.11-1.12.2.jar)
net.ilexiconn.llibrary.server.core.plugin.LLibraryTransformer
net.ilexiconn.llibrary.server.core.patcher.LLibraryRuntimePatcher
GL info: ERROR RuntimeException: No OpenGL context found in the current thread.
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [EntityPlayerMP['NoMercyPro'/297, l='New World', x=323.39, y=64.00, z=-1445.55]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'