Crash upon player login (Stoneblock)

---- Minecraft Crash Report ----

WARNING: coremods are present:
  ComfortsCoreLoadingPlugin (comforts-1.12.2-1.3.1.jar)
  CXLibraryCore (cxlibrary-1.12.1-1.6.1.jar)
  LoadingPlugin (RandomThings-MC1.12.2-4.2.4.jar)
  CoreMod (Aroma1997Core-1.12.2-2.0.0.0.b162.jar)
  EnderCorePlugin (EnderCore-1.12.2-0.5.43.jar)
  ForgelinPlugin (Forgelin-1.8.0.jar)
  IELoadingPlugin (ImmersiveEngineering-core-0.12-86.jar)
  Do not report to Forge! (If you haven't disabled the FoamFix coremod, try disabling it in the config! Note that this bit of text will still appear.) (foamfix-0.10.3-1.12.2.jar)
  LoadingPlugin (ResourceLoader-MC1.12.1-1.5.3.jar)
  JEIDLoadingPlugin (JustEnoughIDs-1.0.1-16.jar)
  llibrary (llibrary-core-1.0.8-1.12.2.jar)
  OpenModsCorePlugin (OpenModsLib-1.12.2-0.12.1.jar)
  CTMCorePlugin (CTM-MC1.12.2-0.3.2.20.jar)
Contact their authors BEFORE contacting forge

// On the bright side, I bought you a teddy bear!

Time: 1/15/19 10:09 PM
Description: Watching Server

java.lang.Error: ServerHangWatchdog detected that a single server tick took 60.00 seconds (should be max 0.05)
    at net.minecraft.world.chunk.Chunk.func_177430_a(Chunk.java:940)
    at net.minecraft.world.World.func_175647_a(World.java:3080)
    at net.minecraft.world.World.func_72872_a(World.java:3063)
    at net.minecraft.entity.item.EntityItem.func_85054_d(EntityItem.java:196)
    at net.minecraft.entity.item.EntityItem.func_70071_h_(EntityItem.java:137)
    at realdrops.entities.EntityItemLoot.func_70071_h_(EntityItemLoot.java:116)
    at net.minecraft.world.World.func_72866_a(World.java:1993)
    at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:832)
    at net.minecraft.world.World.func_72870_g(World.java:1955)
    at net.minecraft.world.World.func_72939_s(World.java:1759)
    at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:613)
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:767)
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397)
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
    at java.lang.Thread.run(Thread.java:748)

---- Minecraft Crash Report ----

WARNING: coremods are present:
  ComfortsCoreLoadingPlugin (comforts-1.12.2-1.3.1.jar)
  CXLibraryCore (cxlibrary-1.12.1-1.6.1.jar)
  LoadingPlugin (RandomThings-MC1.12.2-4.2.4.jar)
  CoreMod (Aroma1997Core-1.12.2-2.0.0.0.b162.jar)
  EnderCorePlugin (EnderCore-1.12.2-0.5.43.jar)
  ForgelinPlugin (Forgelin-1.8.0.jar)
  IELoadingPlugin (ImmersiveEngineering-core-0.12-86.jar)
  Do not report to Forge! (If you haven't disabled the FoamFix coremod, try disabling it in the config! Note that this bit of text will still appear.) (foamfix-0.10.3-1.12.2.jar)
  LoadingPlugin (ResourceLoader-MC1.12.1-1.5.3.jar)
  JEIDLoadingPlugin (JustEnoughIDs-1.0.1-16.jar)
  llibrary (llibrary-core-1.0.8-1.12.2.jar)
  OpenModsCorePlugin (OpenModsLib-1.12.2-0.12.1.jar)
  CTMCorePlugin (CTM-MC1.12.2-0.3.2.20.jar)
Contact their authors BEFORE contacting forge

// Oops.

Time: 1/15/19 10:09 PM
Description: Exception ticking world

java.util.ConcurrentModificationException
    at java.util.HashMap$HashIterator.remove(HashMap.java:1456)
    at net.minecraft.world.gen.ChunkProviderServer.func_73156_b(ChunkProviderServer.java:262)
    at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:207)
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:756)
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397)
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
    at java.lang.Thread.run(Thread.java:748)