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My server has been crashing from "Exception in server tick loop" and I've tried finding the problem but to no avail. Hopefully someone will no what is causing the crashing and/or a way to fix it.

---- Minecraft Crash Report ----

WARNING: coremods are present:
Java8CheckerCoremod (Pixelmon-1.8-4.0.8-universal.jar)
Contact their authors BEFORE contacting forge

// I feel sad now

Time: 10/9/15 1:40 PM
Description: Exception in server tick loop

java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
at java.util.HashMap$EntryIterator.next(HashMap.java:1463)
at java.util.HashMap$EntryIterator.next(HashMap.java:1461)
at com.forgeessentials.util.questioner.Questioner.tick(Questioner.java:103)
at com.forgeessentials.util.questioner.Questioner.tickStart(Questioner.java:134)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_18_Questioner_tickStart_ServerTickEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:55)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:138)
at net.minecraftforge.fml.common.FMLCommonHandler.onPreServerTick(FMLCommonHandler.java:301)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:478)
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: 1.8
Operating System: Linux (amd64) version 2.6.18-400.1.1.el5
Java Version: 1.8.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 3321212600 bytes (3167 MB) / 8520204288 bytes (8125 MB) up to 8520204288 bytes (8125 MB)
JVM Flags: 10 total; -Xms8192M -Xmx8192M -XX:MaxPermSize=256M -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+UseAdaptiveGCBoundary -XX:-UseGCOverheadLimit -XX:+DisableExplicitGC -XX:ErrorFile=/dev/null -XX:UseSSE=3
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
FML: MCP v9.10 FML v8.0.99.99 Minecraft Forge 11.14.3.1450 11 mods loaded, 11 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAAAA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAAAA FML{8.0.99.99} [Forge Mod Loader] (Mod_Forge_1.8-11.14.3.1450.jar)
UCHIJAAAA Forge{11.14.3.1450} [Minecraft Forge] (Mod_Forge_1.8-11.14.3.1450.jar)
UCHIJAAAA ForgeEssentials{1.8.3} [Forge Essentials] (forgeessentials-1.8-1.8.3.49-server.jar)
UCHIJAAAA pixelmon{4.0.8} [Pixelmon] (Pixelmon-1.8-4.0.8-universal.jar)
UCHIJAAAA itemfinder{2.0.0} [ItemFinder] (ItemFinder-1.8-2.0.1-universal.jar)
UCHIJAAAA landdefender{0.5.1} [Land Defender] (landdefender-0.5.1.jar)
UCHIJAAAA pixelextras{1.0.0} [Pixel Extras] (PixelExtras-1.8-1.0-universal.jar)
UCHIJAAAA spawnofpsy{2.0} [SpawnOfPsyduck] (SpawnOfPsyduck-1.8-2.0-universal.jar)
UCHIJAAAA wondertrade{4.1.0} [Wonder Trade] (WonderTrade-1.8-4.1.0-universal.jar)
UCHIJAAAA worldedit{6.1.1-SNAPSHOT} [WorldEdit] (worldedit-forge-mc1.8-6.1.1-SNAPSHOT-dist.jar)
Loaded coremods (and transformers):
Java8CheckerCoremod (Pixelmon-1.8-4.0.8-universal.jar)

ForgeEssentials: Running ForgeEssentials 1.8.3.49 (c586fa7). Modules loaded: Afterlife, Backups, Chat, Commands, Economy, Multiworld, Permissions, PlayerLogger, Protection, Remote, Scripting, SignTools, Teleport, Tickets, WEIntegrationTools, WorldBorder, factions, mapper
Profiler Position: N/A (disabled)
Player Count: 10 / 105; [EntityPlayerMP['CapnZack'/4097, l='Again', x=400229.53, y=83.58, z=3834.10], EntityPlayerMP['ooyy514'/122, l='Again', x=2236.21, y=62.00, z=4493.04], EntityPlayerMP['x1Keith9x'/152867, l='Again', x=15102.66, y=65.00, z=15176.12], EntityPlayerMP['Siege_Legend'/156980, l='Again', x=-1557.70, y=75.00, z=4235.19], EntityPlayerMP['_GR4V1TY_'/265799, l='Again', x=1640.78, y=77.00, z=-1382.85], EntityPlayerMP['XxKyl30nxX'/277586, l='Again', x=-1748.56, y=72.00, z=4180.66], EntityPlayerMP['PinkyMew'/284734, l='Again', x=-1515.94, y=69.00, z=4817.11], EntityPlayerMP['maarlo5'/302766, l='Again', x=15046.03, y=64.00, z=14991.25], EntityPlayerMP['MichielFTW'/302780, l='Again', x=15022.12, y=69.00, z=15007.48], EntityPlayerMP['Livetabon'/315066, l='Again', x=400189.68, y=82.20, z=3852.41]]
Is Modded: Definitely; Server brand changed to 'fml,forge'
Type: Dedicated Server (map_server.txt)

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