error in 1.10.2 moded minecraft

[tfrrft]

i have this problem and i dont know how to fix it

---- Minecraft Crash Report ----

WARNING: coremods are present:
Contact their authors BEFORE contacting forge

// I feel sad now :(

Time: 18/1/2018 8:39 μμ
XRay version: 43
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:280)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:721)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:240)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)
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: 1.10.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1023747144 bytes (976 MB) / 2774810624 bytes (2646 MB) up to 4271112192 bytes (4073 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn228M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
FML: Minecraft 1.10.2 MCP 9.32 Powered by Forge 12.18.3.2511 Optifine OptiFine_1.10.2_HD_U_E3 18 mods loaded, 18 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{9.19} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAAAA FML{8.0.99.99} [Forge Mod Loader] (forge-1.10.2-12.18.3.2511.jar)
UCHIJAAAA Forge{12.18.3.2511} [Minecraft Forge] (forge-1.10.2-12.18.3.2511.jar)
UCHIJAAAA mercurius_updater{1.0} [mercurius_updater] (MercuriusUpdater-1.10.2.jar)
UCHIJAAAA cfm{4.1} [MrCrayfish's Furniture Mod] (cfm-4.1.1-mc1.10.2.jar)
UCHIJAAAA custommainmenu{2.0.5} [Custom Main Menu] (CustomMainMenu-MC1.10.2-2.0.5.jar)
UCHIJAAAA customnpcs{1.9.0_beta} [CustomNPCs] (CustomNPCs_1.10.2_beta(10oct16).jar)
UCHIJAAAA torohealthmod{1.10.2-1} [ToroHealth Damage Indicators] (damage-indicators-mod-by-torocraft-1.10.2.jar)
UCHIJAAAA foamfix{@Version@} [FoamFix] (foamfix.jar)
UCHIJAAAA JEI{3.13.6.393} [Just Enough Items] (jei_1.10.2-3.13.6.393.jar)
UCHIJAAAA metamorph{1.1.3} [Metamorph] (MetaMorph-Mod-1.10.2.jar)
UCHIJAAAA pixelmon{1.3.1} [Pixelmon] (Pixelmon Generations-1.3.1.jar)
UCHIJAAAA treeores{1.0} [TreeOres Mod] (TreeOres-1.10.2-1.0 (1).jar)
UCHIJAAAA VeinMiner{0.35.3_1.9-a46c1b0} [Vein Miner] (VeinMiner-1.9-0.35.3.595+a46c1b0.jar)
UCHIJAAAA VeinMinerModSupport{0.35.3_1.9-a46c1b0} [Mod Support] (VeinMiner-1.9-0.35.3.595+a46c1b0.jar)
UCHIJAAAA wondertrade{4.4.5} [Wondertrade] (WonderTrade-1.10.2-4.4.5-universal.jar)
UCHIJAAAA worldedit{6.1.4} [WorldEdit] (worldedit-forge-mc1.10.2-6.1.4-dist.jar)
UCHIJAAAA XaeroMinimap{1.11.7} [Xaero's Minimap] (Xaeros_Minimap_1.11.7_Forge_1.10.2.jar)
Loaded coremods (and transformers):
GL info: ERROR RuntimeException: No OpenGL context found in the current thread.
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [EntityPlayerMP['niktromos'/362, l='pixelmon solo nick 1.10.2 recrea', x=-453,97, y=56,43, z=-43,33]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'