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trying to install b team server on mac using latest version of OS X and I get this error code. Help please...

Last login: Sat Apr 11 08:37:37 on ttys000
/Users/Moe/Desktop/BTeam_Server_v1/start.command ; exit;
Morgans-MacBook-Air:~ Moe$ /Users/Moe/Desktop/BTeam_Server_v1/start.command ; exit;
Apr 11, 2015 8:38:45 AM net.minecraft.launchwrapper.LogWrapper log
INFO: Loading tweak class name cpw.mods.fml.common.launcher.FMLServerTweaker
Apr 11, 2015 8:38:45 AM net.minecraft.launchwrapper.LogWrapper log
INFO: Using primary tweak class name cpw.mods.fml.common.launcher.FMLServerTweaker
Apr 11, 2015 8:38:45 AM net.minecraft.launchwrapper.LogWrapper log
INFO: Calling tweak class cpw.mods.fml.common.launcher.FMLServerTweaker
2015-04-11 08:38:45 [INFO] [ForgeModLoader] Forge Mod Loader version 6.4.49.965 for Minecraft 1.6.4 loading
2015-04-11 08:38:45 [INFO] [ForgeModLoader] Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_40, running on Mac OS X:x86_64:10.10.3, installed at /Library/Java/JavaVirtualMachines/jdk1.8.0_40.jdk/Contents/Home/jre
2015-04-11 08:38:45 [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.DepLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-04-11 08:38:45 [WARNING] [ForgeModLoader] The coremod worldcore.asm.WCFMLLoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-04-11 08:38:45 [WARNING] [ForgeModLoader] The coremod invtweaks.forge.asm.FMLPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-04-11 08:38:45 [WARNING] [ForgeModLoader] The coremod biomesoplenty.asm.BOPFMLLoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-04-11 08:38:45 [INFO] [STDERR] Warning: version of ForgeMultipart-universal-1.6.4-, 1.0.0.250 is newer than request 1.0.0.244
2015-04-11 08:38:45 [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-04-11 08:38:45 [WARNING] [ForgeModLoader] The coremod cofh.asm.LoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-04-11 08:38:45 [WARNING] [ForgeModLoader] The coremod micdoodle8.mods.miccore.MicdoodlePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-04-11 08:38:45 [WARNING] [ForgeModLoader] The coremod codechicken.nei.asm.NEICorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-04-11 08:38:45 [WARNING] [ForgeModLoader] The coremod openblocks.OpenBlocksCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-04-11 08:38:45 [WARNING] [ForgeModLoader] The coremod openeye.CorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-04-11 08:38:45 [WARNING] [ForgeModLoader] The coremod openmods.OpenModsCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-04-11 08:38:45 [WARNING] [ForgeModLoader] The coremod codechicken.core.launch.DepLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-04-11 08:38:45 [WARNING] [ForgeModLoader] The coremod mrtjp.projectred.compatibility.CompatibilityCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-04-11 08:38:45 [WARNING] [ForgeModLoader] The coremod lumien.randomthings.Transformer.RTLoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-04-11 08:38:45 [WARNING] [ForgeModLoader] The coremod tconstruct.preloader.TConstructLoaderContainer does not have a MCVersion annotation, it may cause issues with this version of Minecraft
2015-04-11 08:38:45 [INFO] [TCon-Preloader] Scalpel. Suction. Lumber axe. CLEAR! *zap*
2015-04-11 08:38:45 [INFO] [TCon-Preloader] Constructing preloader (Modules: [tconstruct.preloader.AccessTransformers, tconstruct.preloader.ASMInterfaceRepair])
2015-04-11 08:38:45 [INFO] [TCon-Preloader] Found a properties file. Attempting load...
2015-04-11 08:38:45 [INFO] [TCon-Preloader] Loaded properties successfully. Using specified settings.
2015-04-11 08:38:45 [INFO] [Tropicraft-Core] Starting to load Tropicraft CoreMods!
2015-04-11 08:38:45 [INFO] [Tropicraft-Core] Constructing preloader (Modules: [tropicraft.asm.ModelBipedTransformer, tropicraft.asm.RenderPlayerTransformer])
2015-04-11 08:38:45 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
2015-04-11 08:38:45 [INFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
2015-04-11 08:38:45 [INFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
2015-04-11 08:38:45 [SEVERE] [ForgeModLoader] Unable to launch
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
at java.util.ArrayList$Itr.remove(ArrayList.java:865)
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(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at cpw.mods.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:48)
at cpw.mods.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:17)...