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I'm having a problem with loading Minecraft 1.6.4 for some unknown reason. I know its something to do with Biomes o Plenty and Thermal expansion working together, because it mentions those two names in the error and when i uninstall Thermal expansion Minecraft loads. Take a look at the error and please comment on solutions ASAP.

Description: There was a severe problem during mod loading that has caused the game to fail

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: thermalexpansion/api/crafting/CraftingHelpers
at cpw.mods.fml.common.LoadController.transition(LoadController.java:156)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:705)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:249)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:509)
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(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.NoClassDefFoundError: thermalexpansion/api/crafting/CraftingHelpers
at biomesoplenty.integration.TEIntegration.addSawMillRecipes(TEIntegration.java:20)
at biomesoplenty.integration.TEIntegration.init(TEIntegration.java:14)
at biomesoplenty.integration.BOPCrossIntegration.postInit(BOPCrossIntegration.java:84)
at biomesoplenty.BiomesOPlenty.postInit(BiomesOPlenty.java:137)
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.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:545)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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.initializeMods(Loader.java:704)
... 10 more
Caused by: java.lang.ClassNotFoundException: thermalexpansion.api.crafting.CraftingHelpers
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 40 more
Caused by: java.lang.NullPointerException


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 8 (amd64) version 6.2
Java Version: 1.7.0_45, Oracle Corporation
Java VM Version: Java HotSpot™ 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 308705864 bytes (294 MB) / 628621312 bytes (599 MB) up to 954728448 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
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 40 mods loaded, 40 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
FML{6.4.49.965} [Forge Mod Loader] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Forge{9.11.1.965} [Minecraft Forge] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
AppliedEnergistics-Core{rv13.c} [AppliedEnergistics Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
CodeChickenCore{0.9.0.7} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Micdoodlecore{} [Micdoodle8 Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
NotEnoughItems{1.6.1.8} [Not Enough Items] (NotEnoughItems_1.61.8.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
DamageIndicatorsMod{2.9.1.5} [Damage Indicators] (1.6.4_DamageIndicatorsv2.9.1.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
mod_ReiMinimap{v3.4_01 [1.6.2]} [mod_ReiMinimap] ([1.6.4]ReiMinimap_v3.4_01.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
cfm{3.2.5} [§4MrCrayfish's Furniture Mod] ([Forge]FurnitureModv3.2.5(1.6.4).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
AppliedEnergistics{rv13.c} [Applied Energistics] (appeng-rv13-c-mc162.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BiomesOPlenty{1.1.2} [Biomes O' Plenty] (BiomesOPlenty-universal-1.6.4-1.1.2.51.jar) Unloaded->Constructed->Pre-initialized->Initialized->Errored
BuildCraft|Core{4.2.1} [BuildCraft] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Builders{4.2.1} [BC Builders] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Energy{4.2.1} [BC Energy] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Factory{4.2.1} [BC Factory] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Transport{4.2.1} [BC Transport] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Silicon{4.2.1} [BC Silicon] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
CoFHCore{2.0.0.2} [CoFH Core] (CoFHCore-2.0.0.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
CoFHLoot{2.0.0.2} [CoFH Loot] (CoFHCore-2.0.0.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
CoFHMasquerade{2.0.0.2} [CoFH Masquerade] (CoFHCore-2.0.0.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
CoFHSocial{2.0.0.2} [CoFH Social] (CoFHCore-2.0.0.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
CoFHWorld{2.0.0.2} [CoFH World] (CoFHCore-2.0.0.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
EnderStorage{1.4.3.4} [EnderStorage] (EnderStorageMod1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ExtraUtilities{1.0.1} [Extra Utilities] (extrautils-1.0.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ForgeMultipart{1.0.0.219} [Forge Multipart] (ForgeMultipart-universal-1.6.4-1.0.0.219.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ThermalExpansion{3.0.0.2} [Thermal Expansion] (ThermalExpansion-3.0.0.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
IC2{2.0.357-experimental} [IndustrialCraft 2] (industrialcraft-2_2.0.357-experimental.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Forestry{2.3.1.1} [Forestry for Minecraft] (forestry-A-2.3.1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
GalacticraftCore{2.0.8} [Galacticraft Core] (Galacticraft-1.6.4-2.0.8.908.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
GalacticraftMars{2.0.8} [Galacticraft Mars] (Galacticraft-Planets-1.6.4-2.0.8.908.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Hats{2.0.2} [Hats] (Hats2.0.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
iChunUtil{2.4.0} [iChunUtil] (iChunUtil2.4.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
IronChest{5.4.1.649} [Iron Chest] (ironchest-universal-1.6.4-5.4.1.649.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Morph{0.3.0} [Morph] (Morph-Beta-0.3.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
OreSpawn{164.13} [OreSpawn] (orespawn164v13.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
PortalGun{2.0.1} [PortalGun] (PortalGun2.0.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
telepads{1.6.4 v5} [Teleportation Pads] (TelePads-1.6.4-v5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
McMultipart{1.0.0.219} [Minecraft Multipart Plugin] (ForgeMultipart-universal-1.6.4-1.0.0.219.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ForgeMicroblock{1.0.0.219} [Forge Microblocks] (ForgeMultipart-universal-1.6.4-1.0.0.219.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized