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I receive this error when attempting to run Minecraft 1.6.4 with Forge 9.1.11.1345 (for 1.6.4):

---- Minecraft Crash Report ----
// Sorry

Time: 4/3/15 3:22 PM
Description: There was a severe problem during mod loading that has caused the game to fail

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: micdoodle8/mods/galacticraft/mars/blocks/GCMarsBlockMachine
at cpw.mods.fml.common.LoadController.transition(LoadController.java:156)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:523)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:183)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:473)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:808)
at net.minecraft.client.main.Main.main(SourceFile:101)
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:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
Caused by: java.lang.NoClassDefFoundError: micdoodle8/mods/galacticraft/mars/blocks/GCMarsBlockMachine
at micdoodle8.mods.galacticraft.mars.blocks.GCMarsBlocks.initBlocks(GCMarsBlocks.java:46)
at micdoodle8.mods.galacticraft.mars.GalacticraftMars.preInit(GalacticraftMars.java:104)
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:483)
at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:545)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
at com.google.common.eventbus.EventBus.post(EventBus.java:267)
at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:201)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:181)
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:483)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
at com.google.common.eventbus.EventBus.post(EventBus.java:267)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:112)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:522)
... 10 more
Caused by: java.lang.ClassNotFoundException: micdoodle8.mods.galacticraft.mars.blocks.GCMarsBlockMachine
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 38 more
Caused by: java.lang.NoClassDefFoundError: micdoodle8/mods/galacticraft/core/blocks/GCCoreBlockTile
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:178)
... 40 more
Caused by: java.lang.ClassNotFoundException: micdoodle8.mods.galacticraft.core.blocks.GCCoreBlockTile
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:97)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 44 more


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

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 109887536 bytes (104 MB) / 297086976 bytes (283 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 5 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -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 v6.4.50.1,345 Minecraft Forge 9.11.1.1345 Optifine OptiFine_1.6.4_HD_D1 53 mods loaded, 53 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized
FML{6.4.50.1,345} [Forge Mod Loader] (minecraftforge-9.11.1.1345.jar) Unloaded->Constructed->Pre-initialized
Forge{9.11.1.1345} [Minecraft Forge] (minecraftforge-9.11.1.1345.jar) Unloaded->Constructed->Pre-initialized
CodeChickenCore{0.9.0.9} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized
ImmibisMicroblocks{57.6.4} [Immibis's Microblocks] (immibis-microblocks-57.6.4.jar) Unloaded->Constructed->Pre-initialized
Micdoodlecore{} [Micdoodle8 Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized
NotEnoughItems{1.6.1.9} [Not Enough Items] (NotEnoughItems-1.6.4-1.6.1.9-universal.jar) Unloaded->Constructed->Pre-initialized
jammyfurniture{4.5} [Jammy Furniture Mod] (1.6.2_Jammy_Furniture_Mod_V4.5.zip) Unloaded->Constructed->Pre-initialized
bspkrsCore{v5.3(1.6.4)} [bspkrsCore] ([1.6.4]bspkrsCorev5.3.zip) Unloaded->Constructed->Pre-initialized
TreeCapitator{Forge 1.6.4.r06} [Treecapitator] ([1.6.4]TreeCapitator.Forge.1.6.4.r06.Universal.jar) Unloaded->Constructed->Pre-initialized
deconstruction{2.0.1} [The Deconstruction Mod] ([MC1.6.4]Deconstruction[v2.0.1].jar) Unloaded->Constructed->Pre-initialized
ArchimedesShipsMod{1.6.2 v1.4.4} [Archimedes' Ships] (ArchimedesShipsMod1.6.4.zip) Unloaded->Constructed->Pre-initialized
Backpack{1.28.37} [Backpack] (Backpacks-Mod-1.6.4.jar) Unloaded->Constructed->Pre-initialized
weaponmod{1.6.2 v1.13.6} [Balkon's WeaponMod] (BalkonsWeaponMod1.6.4.zip) Unloaded->Constructed->Pre-initialized
BiblioCraft{1.5.5} [BiblioCraft] (BiblioCraft[v1.5.5].zip) Unloaded->Constructed->Pre-initialized
BuildCraft|Core{4.2.1} [BuildCraft] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized
BigReactors{0.3.4A2} [Big Reactors] (BigReactors-0.3.4A2.jar) Unloaded->Constructed->Pre-initialized
BuildCraft|Builders{4.2.1} [BC Builders] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized
BuildCraft|Energy{4.2.1} [BC Energy] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized
BuildCraft|Factory{4.2.1} [BC Factory] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized
BuildCraft|Transport{4.2.1} [BC Transport] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized
BuildCraft|Silicon{4.2.1} [BC Silicon] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized
CarpentersBlocks{3.2.8.6} [Carpenter's Blocks] (Carpenter's Blocks v3.2.8.6 - MC 1.6.4.jar) Unloaded->Constructed->Pre-initialized
ChickenChunks{1.3.3.4} [ChickenChunks] (ChickenChunks-1.6.4-1.3.3.4-universal.jar) Unloaded->Constructed->Pre-initialized
eplus{1.16.4} [Enchanting Plus] (EnchantingPlus-1.16.4.jar) Unloaded->Constructed->Pre-initialized
EnderStorage{1.4.3.6} [EnderStorage] (EnderStorage-1.6.4-1.4.3.6-universal.jar) Unloaded->Constructed->Pre-initialized
Forestry{2.3.1.1} [Forestry for Minecraft] (forestry-A-2.3.1.1.jar) Unloaded->Constructed->Pre-initialized
GalacticraftCore{0.1.40} [Galacticraft Core] (GalacticraftMod1.6.4.jar) Unloaded->Constructed->Pre-initialized
GalacticraftMars{2.0.14} [Galacticraft Mars] (Galacticraft-Planets-1.6.4-2.0.14.1098(1).jar) Unloaded->Constructed->Errored
ImmibisCore{57.2.0} [Immibis Core] (immibis-core-57.2.0.jar) Unloaded->Constructed->Pre-initialized
InfernalMobs{1.4.4} [Infernal Mobs] (InfernalMobs_1.6.4.zip) Unloaded->Constructed->Pre-initialized
inventorytweaks{1.56} [Inventory Tweaks] (InventoryTweaks-MC1.6.2-1.56-b77.jar) Unloaded->Constructed->Pre-initialized
IronChest{5.4.1.614} [Iron Chest] (IronChestsMod1.6.4111.zip) Unloaded->Constructed->Pre-initialized
JABBA{1.1.4} [JABBA] (JABBA_1.1.4.zip) Unloaded->Constructed->Pre-initialized
Thaumcraft{4.1.0} [Thaumcraft] (Thaumcraft4.1.0.zip) Unloaded->Constructed->Pre-initialized
MagicBees{2.1.13} [Magic Bees] (magicbees-2.1.13.jar) Unloaded->Constructed->Pre-initialized
MagicYarn{1.0.9} [Magic Yarn] (MagicYarn_1.6.4.zip) Unloaded->Constructed->Pre-initialized
Natura{2.1.14} [Natura] (Natura_mc1.6.X_2.1.14.jar) Unloaded->Constructed->Pre-initialized
pamharvestcraft{1.0} [Pam's HarvestCraft Base] (Pams-HarvestCraft-1.6.4-v1.1.4.zip) Unloaded->Constructed->Pre-initialized
PetBat{1.2.8} [Pet Bat] (PetBat_1.6.4.zip) Unloaded->Constructed->Pre-initialized
ForgeMultipart{1.0.0.182} [Forge Multipart] (ForgeMultipart-universal-1.6.4-1.0.0.182.jar) Unloaded->Constructed->Pre-initialized
ProjRed|Core{4.0.2.6} [Project: Red-Core] (ProjectRedBase-1.6.4-4.0.2.6.jar) Unloaded->Constructed->Pre-initialized
ProjRed|Compatability{4.0.2.6} [ProjectRed-Compatability] (ProjectRedCompat-1.6.4-4.0.2.6.jar) Unloaded->Constructed->Pre-initialized
ProjRed|Integration{4.0.2.6} [ProjectRed-Integration] (ProjectRedIntegration-1.6.4-4.0.2.6.jar) Unloaded->Constructed->Pre-initialized
ProjRed|Transmission{4.0.2.6} [ProjectRed-Transmission] (ProjectRedIntegration-1.6.4-4.0.2.6.jar) Unloaded->Constructed->Pre-initialized
ProjRed|Exploration{4.0.2.6} [ProjectRed-Exploration] (ProjectRedWorld-1.6.4-4.0.2.6.jar) Unloaded->Constructed->Pre-initialized
ProjRed|Illumination{4.0.2.6} [ProjectRed-Illumination] (ProjectRedWorld-1.6.4-4.0.2.6.jar) Unloaded->Constructed->Pre-initialized
mod_ReiMinimap{v3.4_01 [1.6.2]} [mod_ReiMinimap] (ReisMinimap1.6.4.zip) Unloaded->Constructed->Pre-initialized
satscapesimukraft{0.12.0 Beta} [Sim-U-Kraft] (Sim-U-Kraft-0.12.0.zip) Unloaded->Constructed->Pre-initialized
TwilightForest{1.20.0} [The Twilight Forest] (TwilightForestMod1.6.4.jar) Unloaded->Constructed->Pre-initialized
witchery{0.20.5} [Witchery] (witchery-1.6.4-0.20.5.zip) Unloaded->Constructed->Pre-initialized
McMultipart{1.0.0.182} [Minecraft Multipart Plugin] (ForgeMultipart-universal-1.6.4-1.0.0.182.jar) Unloaded->Constructed->Pre-initialized
ForgeMicroblock{1.0.0.182} [Forge Microblocks] (ForgeMultipart-universal-1.6.4-1.0.0.182.jar) Unloaded->Constructed->Pre-initialized

Any help would be greatly appreciated. I've been trying to build my 'Dream 1.6.4' Modpack.