i had the same problem (sort of) but it didnt work, this is what is says:
C:\Users\Ronny\Desktop\monsterserver>java -Xms2048m -Xmx2048m -XX
ermSize=128m
-jar FTBServer-1.6.4-965.jar nogui
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=128m; suppor
t was removed in 8.0
nov 09, 2015 3:00:42 EM net.minecraft.launchwrapper.LogWrapper log
INFO: Loading tweak class name cpw.mods.fml.common.launcher.FMLServerTweaker
nov 09, 2015 3:00:42 EM net.minecraft.launchwrapper.LogWrapper log
INFO: Using primary tweak class name cpw.mods.fml.common.launcher.FMLServerTweak
er
nov 09, 2015 3:00:42 EM net.minecraft.launchwrapper.LogWrapper log
INFO: Calling tweak class cpw.mods.fml.common.launcher.FMLServerTweaker
2015-11-09 15:00:42 [INFO] [ForgeModLoader] Forge Mod Loader version 6.4.49.965
for Minecraft 1.6.4 loading
2015-11-09 15:00:42 [INFO] [ForgeModLoader] Java is Java HotSpot(TM) 64-Bit Serv
er VM, version 1.8.0_65, running on Windows 10:amd64:10.0, installed at C:\Progr
am Files\Java\jre1.8.0_65
2015-11-09 15:00:42 [VARNING] [ForgeModLoader] The coremod codechicken.core.laun
ch.DepLoader does not have a MCVersion annotation, it may cause issues with this
version of Minecraft
2015-11-09 15:00:42 [VARNING] [ForgeModLoader] The coremod worldcore.asm.WCFMLLo
adingPlugin does not have a MCVersion annotation, it may cause issues with this
version of Minecraft
2015-11-09 15:00:42 [VARNING] [ForgeModLoader] The coremod appeng.transformer.Ap
pEngCore does not have a MCVersion annotation, it may cause issues with this ver
sion of Minecraft
2015-11-09 15:00:42 [INFO] [ForgeModLoader] [AppEng] Core Init
2015-11-09 15:00:42 [VARNING] [ForgeModLoader] The coremod aroma1997.core.coremo
d.CoreMod does not have a MCVersion annotation, it may cause issues with this ve
rsion of Minecraft
2015-11-09 15:00:42 [VARNING] [ForgeModLoader] The coremod biomesoplenty.asm.BOP
FMLLoadingPlugin does not have a MCVersion annotation, it may cause issues with
this version of Minecraft
2015-11-09 15:00:42 [INFO] [STDERR] Warning: version of ForgeMultipart-universal
-1.6.4-, 1.0.0.250 is newer than request 1.0.0.244
2015-11-09 15:00:42 [VARNING] [ForgeModLoader] The coremod calclavia.lib.Calclav
iaPluginLoader does not have a MCVersion annotation, it may cause issues with th
is version of Minecraft
2015-11-09 15:00:42 [VARNING] [ForgeModLoader] The coremod codechicken.core.laun
ch.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issu
es with this version of Minecraft
2015-11-09 15:00:42 [VARNING] [ForgeModLoader] The coremod cofh.asm.LoadingPlugi
n does not have a MCVersion annotation, it may cause issues with this version of
Minecraft
2015-11-09 15:00:42 [VARNING] [ForgeModLoader] The coremod denoflionsx.denLib.Co
reMod.denLibCore does not have a MCVersion annotation, it may cause issues with
this version of Minecraft
2015-11-09 15:00:42 [VARNING] [ForgeModLoader] The coremod denoflionsx.DenPipes.
Core.DenPipesCoreMod does not have a MCVersion annotation, it may cause issues w
ith this version of Minecraft
2015-11-09 15:00:42 [VARNING] [ForgeModLoader] The coremod mcp.mobius.evoc.asm.C
oreDescription does not have a MCVersion annotation, it may cause issues with th
is version of Minecraft
2015-11-09 15:00:42 [VARNING] [ForgeModLoader] The coremod ic2.core.coremod.IC2c
ore does not have a MCVersion annotation, it may cause issues with this version
of Minecraft
2015-11-09 15:00:42 [VARNING] [ForgeModLoader] The coremod invtweaks.forge.asm.F
MLPlugin does not have a MCVersion annotation, it may cause issues with this ver
sion of Minecraft
2015-11-09 15:00:42 [VARNING] [ForgeModLoader] The coremod logisticspipes.asm.Lo
gisticsPipesCoreLoader does not have a MCVersion annotation, it may cause issues
with this version of Minecraft
2015-11-09 15:00:42 [VARNING] [ForgeModLoader] The coremod mcp.mobius.mobiuscore
.asm.CoreDescription does not have a MCVersion annotation, it may cause issues w
ith this version of Minecraft
2015-11-09 15:00:42 [VARNING] [ForgeModLoader] The coremod codechicken.nei.asm.N
EICorePlugin does not have a MCVersion annotation, it may cause issues with this
version of Minecraft
2015-11-09 15:00:43 [VARNING] [ForgeModLoader] The coremod openblocks.OpenBlocks
CorePlugin does not have a MCVersion annotation, it may cause issues with this v
ersion of Minecraft
2015-11-09 15:00:43 [VARNING] [ForgeModLoader] The coremod openmods.OpenModsCore
Plugin does not have a MCVersion annotation, it may cause issues with this versi
on of Minecraft
2015-11-09 15:00:43 [VARNING] [ForgeModLoader] The coremod codechicken.core.laun
ch.DepLoader does not have a MCVersion annotation, it may cause issues with this
version of Minecraft
2015-11-09 15:00:43 [VARNING] [ForgeModLoader] The coremod mrtjp.projectred.comp
atibility.CompatibilityCorePlugin does not have a MCVersion annotation, it may c
ause issues with this version of Minecraft
2015-11-09 15:00:43 [VARNING] [ForgeModLoader] The coremod lumien.randomthings.T
ransformer.RTLoadingPlugin does not have a MCVersion annotation, it may cause is
sues with this version of Minecraft
2015-11-09 15:00:43 [VARNING] [ForgeModLoader] The coremod tconstruct.preloader.
TConstructLoaderContainer does not have a MCVersion annotation, it may cause iss
ues with this version of Minecraft
2015-11-09 15:00:43 [INFO] [TCon-Preloader] Scalpel. Suction. Lumber axe. CLEAR!
*zap*
2015-11-09 15:00:43 [INFO] [TCon-Preloader] Constructing preloader (Modules: [tc
onstruct.preloader.AccessTransformers, tconstruct.preloader.ASMInterfaceRepair])
2015-11-09 15:00:43 [INFO] [TCon-Preloader] Found a properties file. Attempting
load...
2015-11-09 15:00:43 [INFO] [TCon-Preloader] Loaded properties successfully. Usin
g specified settings.
2015-11-09 15:00:43 [VARNING] [ForgeModLoader] The coremod universalelectricity.
core.UELoader does not have a MCVersion annotation, it may cause issues with thi
s version of Minecraft
2015-11-09 15:00:43 [VARNING] [ForgeModLoader] The coremod codechicken.core.laun
ch.DepLoader does not have a MCVersion annotation, it may cause issues with this
version of Minecraft
2015-11-09 15:00:43 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fm
l.common.launcher.FMLInjectionAndSortingTweaker
2015-11-09 15:00:43 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fm
l.common.launcher.FMLDeobfTweaker
2015-11-09 15:00:43 [INFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.com
mon.launcher.FMLInjectionAndSortingTweaker
2015-11-09 15:00:43 [ALLVARLIG] [ForgeModLoader] Unable to launch
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
at java.util.ArrayList$Itr.remove(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at cpw.mods.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.j
ava:48)
at cpw.mods.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.
java:17)
C:\Users\Ronny\Desktop\monsterserver>pause
Press any key to continue . . .