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I'm having a bit of trouble trying to create a world with a modded client and each time I try to create a new world it crashes.

The Log:

---- Minecraft Crash Report ----
// Shall we play a game?

Time: 8/3/14 8:34 PM
Description: Updating screen events

java.lang.NoClassDefFoundError: micdoodle8/mods/galacticraft/core/entities/player/GCCorePlayerMP
at net.minecraft.server.integrated.IntegratedServer.<init>(IntegratedServer.java:30)
at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2001)
at net.minecraft.client.gui.GuiCreateWorld.func_73875_a(GuiCreateWorld.java:285)
at net.minecraft.client.gui.GuiScreen.func_73864_a(SourceFile:69)
at net.minecraft.client.gui.GuiCreateWorld.func_73864_a(GuiCreateWorld.java:439)
at net.minecraft.client.gui.GuiScreen.func_73867_d(SourceFile:128)
at net.minecraft.client.gui.GuiScreen.func_73862_m(SourceFile:107)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1566)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:910)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)
at net.minecraft.client.main.Main.main(SourceFile:101)
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 net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
Caused by: java.lang.ClassNotFoundException: micdoodle8.mods.galacticraft.core.entities.player.GCCorePlayerMP
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 17 more
Caused by: java.lang.NullPointerException
at org.objectweb.asm.ClassReader.<init>(Unknown Source)
at micdoodle8.mods.miccore.MicdoodleTransformer.transform9(MicdoodleTransformer.java:770)
at micdoodle8.mods.miccore.MicdoodleTransformer.transform(MicdoodleTransformer.java:314)
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:274)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:172)
... 19 more


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
at net.minecraft.server.integrated.IntegratedServer.<init>(IntegratedServer.java:30)
at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2001)
at net.minecraft.client.gui.GuiCreateWorld.func_73875_a(GuiCreateWorld.java:285)
at net.minecraft.client.gui.GuiScreen.func_73864_a(SourceFile:69)
at net.minecraft.client.gui.GuiCreateWorld.func_73864_a(GuiCreateWorld.java:439)
at net.minecraft.client.gui.GuiScreen.func_73867_d(SourceFile:128)
at net.minecraft.client.gui.GuiScreen.func_73862_m(SourceFile:107)

-- Affected screen --
Details:
Screen name: net.minecraft.client.gui.GuiMainMenu
Stacktrace:
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1566)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:910)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)
at net.minecraft.client.main.Main.main(SourceFile:101)
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 net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_65, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 220806120 bytes (210 MB) / 405524480 bytes (386 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v8.11 FML v6.4.49.965 Minecraft Forge 9.11.1.965 Optifine OptiFine_1.6.4_HD_U_D1 43 mods loaded, 43 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML{6.4.49.965} [Forge Mod Loader] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge{9.11.1.965} [Minecraft Forge] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Micdoodlecore{} [Micdoodle8 Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
monnef-core{0.6.3} [monnef Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
TooManyItems{1.6.4} [TooManyItems] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
vendingmachine{0.3.2} [Vending Machine Mod] ([1.6.4]VendingMachine_v0.3.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod.ymt.cmn.YMTLib{164v2} [YMTLib] (YMTLib-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod.ymt.air.HariboteAirCraft{164v3 cassini} [HariboteAirCraft] (AirCraft-Mod-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Autoutils{1.0.1} [Autoutils] (Autoutils-1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
weaponmod{1.6.2 v1.13.6} [Balkon's WeaponMod] (Balkons-Weapon-Mod-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BiblioCraft{1.5.5} [BiblioCraft] (BiblioCraft[v1.5.5].zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
BiomesOPlenty{1.2.1} [Biomes O' Plenty] (BiomesOPlenty-universal-1.6.4-1.2.1.434.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Chisel{1.5.0} [Chisel] (Chisel-Mod-1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
coralmod{1.6.4} [CoralReef Mod] (Coral-Reef-Mod-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
craftguide{1.5.2} [CraftGuide] (CraftGuide-1.6.7.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CustomSpawner{2.3.1} [DrZhark's CustomSpawner] (CustomMobSpawner 2.3.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CyanSwords{1.9.0} [Cyan Warrior Swords] (Cyan-Warrior-Swords-Mod-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
props{1.10} [DecoCraft] (DecoCraft-Mod-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MagicCarpet{1.2} [DrZhark's Magic Carpet Mod] (DrZharks MagicCarpet Mod v1.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MoCreatures{6.1.0} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.1.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
ExtrabiomesXL{3.15.8} [ExtrabiomesXL] (ExtrabiomesXL-universal-1.6.4-3.15.8.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Jaffas{0.6.3} [Jaffas and more!] (jaffas_0.6.3d.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Jaffas-Trees{0.6.3} [Jaffas - Trees] (jaffas_0.6.3d.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Jaffas-Technic{0.6.3} [Jaffas - Technic] (jaffas_0.6.3d.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Jaffas-Power{0.6.3} [Jaffas - Power] (jaffas_0.6.3d.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Jaffas-Xmas{0.6.3} [Jaffas - Xmas] (jaffas_0.6.3d.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
SlimevoidLib{2.0.3.1} [Slimevoid Library] (SlimevoidLib-Universal-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
LittleBlocks{2.2.2.1} [Little Blocks] (Little-Blocks-Mod-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
LostBooks{1.1} [Lost Books] (LostBooks 1.0 (bin) for MC 1.6.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
LotsOfFood{1.6.4} [Lots of Food] (Lots of Food 1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
monnef-core-helper{0.6.3} [monnef Core ~] (monnef_core_0.6.3b.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MoreSwordsMod{2.6.0} [More Swords Mod] (More Swords Mod 2.6.0 For 1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
moreplayermodels{2} [MorePlayerModels V2] (More-Player-Models-2-Mod-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
cfm{3.3.4} [MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.3.4(1.6.4).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
PaintersFlowerPot{v1.59} [Painter's Flower Pot] (Painters-Flower-Pot-Mod-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
pamweeeflowers{1.1} [Pam's Weee! Flowers] (Pams-Weee-Flowers-Mod-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
TLSpecialArmor{1.6.4} [SpecialArmor] (Special-Armor-Mod-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
stillhungry{2.0.1} [Still Hungry!] (Still-Hungry-Mod-1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
camping{2.0e} [The Camping Mod 2.0] (TheCampingMod_2.0e.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
TwilightForest{1.20.5} [The Twilight Forest] (twilightforest-1.6.4-1.20.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
UsefulFood{1.4.4} [UsefulFood] (UsefulFood-1.6.2_1.4.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_ZanMinimap{0.9.4} [Zan's Minimap] (ZansMinimap1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Launched Version: 1.6.4-Forge9.11.1.965
LWJGL: 2.9.0
OpenGL: Quadro NVS 110M/PCI/SSE2 GL version 2.1.2, NVIDIA Corporation
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Pack: Default
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

-------------------------------------------------

is there anyway to fix this? (I've used these mods all together previously and they all worked fine up until just now)