Installed Mods:
AE2
Big Reactors
EE3
Extra Utilities
Mekanism
Mekanism Generators
Mekanism Tools

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

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: erogenousbeef/bigreactors/common/block/BlockBRDevice
at cpw.mods.fml.common.LoadController.transition(LoadController.java:162)
at cpw.mods.fml.common.Loader.preinitializeMods(Loader.java:515)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:239)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:480)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:867)
at net.minecraft.client.main.Main.main(SourceFile:148)
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:134)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.NoClassDefFoundError: erogenousbeef/bigreactors/common/block/BlockBRDevice
at erogenousbeef.bigreactors.common.BRLoader.preInit(BRLoader.java:46)
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:513)
at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:208)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:187)
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.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:118)
at cpw.mods.fml.common.Loader.preinitializeMods(Loader.java:513)
... 10 more
Caused by: java.lang.ClassNotFoundException: erogenousbeef.bigreactors.common.block.BlockBRDevice
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:188)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 37 more
Caused by: java.lang.NoClassDefFoundError: cofh/core/block/BlockCoFHBase
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:180)
... 39 more
Caused by: java.lang.ClassNotFoundException: cofh.core.block.BlockCoFHBase
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:99)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 43 more

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

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_05, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 36844392 bytes (35 MB) / 322961408 bytes (308 MB) up to 3817865216 bytes (3641 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.05 FML v7.10.25.1208 Minecraft Forge 10.13.0.1208 14 mods loaded, 14 mods active
mcp{9.05} Minecraft Coder Pack Unloaded->Constructed->Pre-initialized
FML{7.10.25.1208} Forge Mod Loader Unloaded->Constructed->Pre-initialized
Forge{10.13.0.1208} Minecraft Forge Unloaded->Constructed->Pre-initialized
AppliedEnergistics2-Core{rv1-alpha-17} AppliedEnergistics2 Core Unloaded->Constructed->Pre-initialized
ForgeMultipart{1.1.0.297} Forge Multipart Unloaded->Constructed->Pre-initialized
ExtraUtilities{1.1.0k} Extra Utilities Unloaded->Constructed->Pre-initialized
Mekanism{7.1.0} Mekanism Unloaded->Constructed->Pre-initialized
appliedenergistics2{rv1-alpha-17} Applied Energistics 2 Unloaded->Constructed->Pre-initialized
BigReactors{0.4.0rc8} Big Reactors Unloaded->Constructed->Errored
EE3{0.2.0} Equivalent Exchange 3 Unloaded->Constructed->Pre-initialized
MekanismGenerators{7.1.0} MekanismGenerators Unloaded->Constructed->Pre-initialized
MekanismTools{7.1.0} MekanismTools Unloaded->Constructed->Pre-initialized
McMultipart{1.1.0.297} Minecraft Multipart Plugin Unloaded->Constructed->Pre-initialized
ForgeMicroblock{1.1.0.297} Forge Microblocks Unloaded->Constructed->Pre-initialized
AE2 Version: alpha rv1-alpha-17 for Forge 10.13.0.1162