1.8 Forge Server crashing?

[Scrotty]

If multiple users connecting to a server are using a different Forge version could it cause crashing? Either that or the server mods are my amateur theories. Crash reports appear to be differ but here's one...it crashes often..

 

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 6/24/15 10:38 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:270)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:716)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:364)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:598)
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: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1997176288 bytes (1904 MB) / 3126853632 bytes (2982 MB) up to 3126853632 bytes (2982 MB)
JVM Flags: 2 total; -Xms3G -Xmx3G
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
FML: MCP v9.10 FML v8.0.99.99 Minecraft Forge 11.14.3.1450 10 mods loaded, 10 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] (forge-1.8-11.14.3.1450-universal.jar) 
UCHIJAAAA	Forge{11.14.3.1450} [Minecraft Forge] (forge-1.8-11.14.3.1450-universal.jar) 
UCHIJAAAA	k4lib{1.8-1.0.4} [K4Lib] (k4lib-1.8-1.0.4-universal.jar) 
UCHIJAAAA	colorchat{1.8-1.0.3} [ColorChat] (colorchat-1.8-1.0.3-universal.jar) 
UCHIJAAAA	landdefender{0.4.0} [Land Defender] (landdefender-0.4.0.jar) 
UCHIJAAAA	ModControl{1.4} [Mod Control] (ModControl-1.4.jar) 
UCHIJAAAA	pixelmon{4.0.5} [Pixelmon] (Pixelmon-1.8-4.0.5-universal.jar) 
UCHIJAAAA	SpawnCommands{2.2.0} [spawnCommands] (SpawnCommands-2.2.0-mc1.8-forge.jar) 
UCHIJAAAA	worldedit{6.1} [WorldEdit] (worldedit-forge-mc1.8-6.1.jar) 
Loaded coremods (and transformers): 
Profiler Position: N/A (disabled)
Player Count: 6 / 20; [EntityPlayerMP['Master_Yen'/1148, l='world', x=198.51, y=73.31, z=-161.51], EntityPlayerMP['David8505'/1582, l='world', x=142.06, y=76.02, z=286.19], EntityPlayerMP['iiFazedPvP'/3275, l='world', x=303.23, y=67.02, z=283.55], EntityPlayerMP['ThePizzaDinosaur'/41252, l='world', x=372.61, y=83.00, z=224.40], EntityPlayerMP['Hydra_of_Death'/4722, l='world', x=267.92, y=64.00, z=248.37], EntityPlayerMP['tubs787'/43169, l='world', x=359.50, y=72.00, z=242.07]]
Is Modded: Definitely; Server brand changed to 'fml,forge'
Type: Dedicated Server (map_server.txt)

 

 

[Scrotty]

Any suggestion on which one I should remove first? Pixelmon is the main mod, I'm not using the recommended Forge version for the mod but that version is not server friendly. Immense console spam, which was fixed in a later version but the mod still hasn't updated to it. I'm using the latest recommended version for my server.

 

Another mod I really hope it isn't is ModControl, because it blocks any client side mods except those I permit..