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I am trying to run a flans gamepack 1.7.2 server and it will not start. I will paste the log down below.

[19:51:11] [main/INFO] [FML/]: Forge Mod Loader version 7.2.211.1121 for Minecraft 1.7.2 loading
[19:51:12] [main/INFO] [FML/]: Java is Java HotSpot(TM) Client VM, version 1.8.0_40, running on Windows 8:x86:6.2, installed at C:\Program Files (x86)\Java\jre1.8.0_40
[19:51:12] [main/DEBUG] [FML/]: Java classpath at launch is dogs.jar
[19:51:12] [main/DEBUG] [FML/]: Java library path at launch is C:\ProgramData\Oracle\Java\javapath;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;c:\Program Files (x86)\Intel\iCLS Client\;c:\Program Files\Intel\iCLS Client\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Skype\Phone\;.
[19:51:12] [main/DEBUG] [FML/]: Enabling runtime deobfuscation
[19:51:12] [main/DEBUG] [FML/]: Instantiating coremod class FMLCorePlugin
[19:51:12] [main/DEBUG] [FML/]: Added access transformer class cpw.mods.fml.common.asm.transformers.AccessTransformer to enqueued access transformers
[19:51:12] [main/DEBUG] [FML/]: Enqueued coremod FMLCorePlugin
[19:51:12] [main/DEBUG] [FML/]: Instantiating coremod class FMLForgePlugin
[19:51:12] [main/DEBUG] [FML/]: Added access transformer class net.minecraftforge.transformers.ForgeAccessTransformer to enqueued access transformers
[19:51:12] [main/DEBUG] [FML/]: Enqueued coremod FMLForgePlugin
[19:51:12] [main/DEBUG] [FML/]: All fundamental core mods are successfully located
[19:51:12] [main/DEBUG] [FML/]: Discovering coremods
[19:51:12] [main/DEBUG] [FML/]: Examining for coremod candidacy CustomNPCs_1.7.2.jar
[19:51:12] [main/DEBUG] [FML/]: Not found coremod data in CustomNPCs_1.7.2.jar
[19:51:12] [main/DEBUG] [FML/]: Examining for coremod candidacy DrZharks MoCreatures Mod v6.2.1.jar
[19:51:12] [main/DEBUG] [FML/]: Examining for coremod candidacy Flans Mod-1.7.2-4.3.0.jar
[19:51:12] [main/DEBUG] [FML/]: Not found coremod data in Flans Mod-1.7.2-4.3.0.jar
[19:51:12] [main/DEBUG] [FML/]: Examining for coremod candidacy FoodPlus-1.7.2-3.0rS.jar
[19:51:12] [main/DEBUG] [FML/]: Not found coremod data in FoodPlus-1.7.2-3.0rS.jar
[19:51:12] [main/DEBUG] [FML/]: Examining for coremod candidacy JumpFly.jar
[19:51:12] [main/DEBUG] [FML/]: Not found coremod data in JumpFly.jar
[19:51:12] [main/INFO] [LaunchWrapper/]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[19:51:12] [main/INFO] [LaunchWrapper/]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[19:51:12] [main/INFO] [LaunchWrapper/]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[19:51:12] [main/ERROR] [LaunchWrapper/]: Unable to launch
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_40]
at java.util.ArrayList$Itr.remove(Unknown Source) ~[?:1.8.0_40]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:117) [launchwrapper-1.9.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_40]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_40]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_40]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_40]
at cpw.mods.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:43) [dogs.jar:?]
at cpw.mods.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:12) [dogs.jar:?]