Help Me Please? Thanks!

Ive been having this crash that im having big issues dealing with. If anyone here can help me it would be greatly appreciated! thank you all.

---- Minecraft Crash Report ----

WARNING: coremods are present:
  SpongeCoremod (spongeforge-1.10.2-2281-5.2.0-BETA-2379.jar)
Contact their authors BEFORE contacting forge

// This doesn't make any sense!

Time: 6/14/17 4:49 PM
Description: Exception ticking world

java.util.concurrent.RejectedExecutionException: Task net.minecraft.world.WorldServer$$Lambda$900/306264777@33529c8f rejected from java.util.concurrent.ThreadPoolExecutor@740d05b8[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 1811217]
	at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2047)
	at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:823)
	at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1369)
	at java.util.concurrent.Executors$DelegatedExecutorService.execute(Executors.java:668)
	at net.minecraft.world.WorldServer.updateLightAsync(WorldServer.java:3926)
	at net.minecraft.world.WorldServer.func_180500_c(WorldServer.java:3751)
	at net.minecraft.world.World.func_175664_x(World.java:2776)
	at net.minecraft.world.WorldServer.func_184162_i(WorldServer.java:360)
	at net.minecraft.world.WorldServer.func_147456_g(WorldServer.java:1917)
	at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:220)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:698)
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)
	at java.lang.Thread.run(Thread.java:745)

My mods/plugins are

Pixelmon 5.1.1
Kits 1.7.4
Nucleus 1.0.0
Latest Pex
Pixelmon extras 2.2.8
spongeforge-1.10.2-2281-5.2.0-BETA-2379.jar

This might help you: https://github.com/SpongePowered/SpongeForge/issues/1534