Here It is please help me.

---- Minecraft Crash Report ----
// You're mean.

Time: 12/12/16 5:08 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: Lmekanism/generators/common/GeneratorsCommonProxy;
at cpw.mods.fml.common.LoadController.transition(LoadController.java:163)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:544)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:208)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:480)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)
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:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.NoClassDefFoundError: Lmekanism/generators/common/GeneratorsCommonProxy;
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Unknown Source)
at java.lang.Class.getDeclaredField(Unknown Source)
at cpw.mods.fml.common.ProxyInjector.inject(ProxyInjector.java:43)
at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:512)
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:212)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:190)
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:119)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:513)
... 10 more
Caused by: java.lang.ClassNotFoundException: mekanism.generators.common.GeneratorsCommonProxy
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 36 more
Caused by: java.lang.NoClassDefFoundError: mekanism/common/base/IGuiProvider
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:182)
... 38 more
Caused by: java.lang.ClassNotFoundException: mekanism.common.base.IGuiProvider
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 42 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_101, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 141850520 bytes (135 MB) / 411566080 bytes (392 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
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1558 Optifine OptiFine_1.7.10_HD_U_D6 62 mods loaded, 49 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UC mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UC FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1558-1.7.10.jar)
UC Forge{10.13.4.1558} [Minecraft Forge] (forge-1.7.10-10.13.4.1558-1.7.10.jar)
UC CodeChickenCore{1.0.7.47} [CodeChicken Core] (minecraft.jar)
UC NotEnoughItems{1.0.5.120} [Not Enough Items] (Not-Enough-Items-1.7.10-Latest.jar)
UC {000} [CoFH ASM] (minecraft.jar)
UC FLabsBF{4.3} [Better Furnaces] ([1.7.10]Better_Furnaces_V4.3.jar)
UC adventurebackpack{1.7.10-0.8b} [Adventure Backpack] (adventurebackpack-1.7.10-0.8c.jar)
UC CarpentersBlocks{3.3.8.1} [Carpenter's Blocks] (Carpenter's Blocks v3.3.8.1 - MC 1.7.10.jar)
UC CobbleDrops{1.7.10.01} [CobbleDrops] (CobbleDrops 1.7.10.01.jar)
UC CoFHCore{1.7.10R3.1.3} [CoFH Core] (CoFHCore-[1.7.10]3.1.3-327.jar)
UC cosmeticarmorreworked{1.7.10-v6a} [CosmeticArmorReworked] (CosmeticArmorReworked-1.7.10-v6a.jar)
UC endercore{1.7.10-0.2.0.39_beta} [EnderCore] (EnderCore-1.7.10-0.2.0.39_beta.jar)
UC MineFactoryReloaded{1.7.10R2.8.2B1} [MineFactory Reloaded] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UC Waila{1.5.10} [Waila] (Waila-1.5.10_1.7.10.jar)
UC EnderIO{1.7.10-2.3.0.429_beta} [Ender IO] (EnderIO-1.7.10-2.3.0.429_beta.jar)
UC exnihilo{1.38-53} [Ex Nihilo] (Ex-Nihilo-1.38-53.jar)
UC ThermalFoundation{1.7.10R1.2.5} [Thermal Foundation] (ThermalFoundation-[1.7.10]1.2.5-115.jar)
UC ThermalExpansion{1.7.10R4.1.4} [Thermal Expansion] (ThermalExpansion-[1.7.10]4.1.4-247.jar)
UC RedstoneArsenal{1.7.10R1.1.2} [Redstone Arsenal] (RedstoneArsenal-[1.7.10]1.1.2-92.jar)
UC ForgeMultipart{1.2.0.345} [Forge Multipart] (ForgeMultipart-1.7.10-1.2.0.345-universal.jar)
UC ExtraUtilities{1.2.12} [Extra Utilities] (extrautilities-1.2.12.jar)
UC Mantle{1.7.10-0.3.2.jenkins191} [Mantle] (Mantle-1.7.10-0.3.2b.jar)
UC TConstruct{1.7.10-1.8.8.build988} [Tinkers' Construct] (TConstruct-1.7.10-1.8.8.jar)
UC exastrisrebirth{MC1.7.10-1.01-45} [Ex Astris Rebirth] (Ex-Astris-Rebirth-MC1.7.10-1.01-45.jar)
UC ExtraTiC{1.4.6} [ExtraTiC] (ExtraTiC-1.7.10-1.4.6.jar)
UC FWG{1.0.3} [Fun World Gen] (FWG-1.0.3.jar)
UC IronChest{6.0.62.742} [Iron Chest] (ironchest-1.7.10-6.0.62.742-universal.jar)
UC Mekanism{8.1.9} [Mekanism] (Mekanism-1.7.10-8.1.9.265.jar)
UE MekanismGenerators{9.1.0} [MekanismGenerators] (MekanismGenerators-1.7.10-9.1.0.281.jar)
UC MekanismTools{9.1.0} [MekanismTools] (MekanismTools-1.7.10-9.1.0.281.jar)
UC MineFactoryReloaded|CompatForgeMicroblock{1.7.10R2.8.2B1} [MFR Compat: ForgeMicroblock] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UC MineFactoryReloaded|CompatThermalExpansion{1.7.10R2.8.2B1} [MFR Compat: Thermal Expansion] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UC MineFactoryReloaded|CompatTConstruct{1.7.10R2.8.2B1} [MFR Compat: Tinkers' Construct] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UC MineFactoryReloaded|CompatVanilla{1.7.10R2.8.2B1} [MFR Compat: Vanilla] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UC NetherOres{1.7.10R2.3.1} [Nether Ores] (NetherOres-[1.7.10]2.3.1-22.jar)
UC SkyLandsForge{1.7.10_0.0.3fix} [SkyLandsForge] (SkyLandsForge-1.7.10_0.0.3fix.jar)
UC ThermalDynamics{1.7.10R1.2.0} [Thermal Dynamics] (ThermalDynamics-[1.7.10]1.2.0-171.jar)
UC TiConAutoToolStation{1.1.2} [Tinkers Construct Auto Tool Station] (TiConAutoToolStation-1.7.10-1.1.2.jar)
UC TiCTooltips{1.2.5} [TiC Tooltips] (TiCTooltips-mc1.7.10-1.2.5.jar)
UC treeGrowingSimulator{0.0.3} [Tree Growing Simulator 2014] (TreeGrowingSimulator2014-MC1.7.10-0.0.3-22.jar)
UC VeinMiner{0.34.1_1.7.10-4d066f1} [Vein Miner] (VeinMiner-0.34.1-1.7.10r473+4d066f1.jar)
UC VeinMinerModSupport{0.34.1_1.7.10-4d066f1} [Mod Support] (VeinMiner-0.34.1-1.7.10r473+4d066f1.jar)
UC WailaHarvestability{1.1.5} [Waila Harvestability] (WailaHarvestability-mc1.7.10-1.1.5.jar)
UC wawla{1.3.1} [What Are We Looking At] (Wawla-1.0.5.120.jar)
UC McMultipart{1.2.0.345} [Minecraft Multipart Plugin] (ForgeMultipart-1.7.10-1.2.0.345-universal.jar)
UC IguanaTweaksTConstruct{1.7.10-2.1.6.163} [Iguana Tinker Tweaks] (IguanaTinkerTweaks-1.7.10-2.1.6.jar)
UC MooFluids{1.7.10-1.5.01.19a} [Moo Fluids] (MooFluids-1.7.10-1.5.01.19a.jar)
UC ForgeMicroblock{1.2.0.345} [Forge Microblocks] (ForgeMultipart-1.7.10-1.2.0.345-universal.jar)
UD MineFactoryReloaded|CompatAppliedEnergistics{1.7.10R2.8.2B1} [MFR Compat: Applied Energistics] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UD MineFactoryReloaded|CompatAtum{1.7.10R2.8.2B1} [MFR Compat: Atum] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UD MineFactoryReloaded|CompatBackTools{1.7.10R2.8.2B1} [MFR Compat: BackTools] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UD MineFactoryReloaded|CompatBuildCraft{1.7.10R2.8.2B1} [MFR Compat: BuildCraft] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UD MineFactoryReloaded|CompatChococraft{1.7.10R2.8.2B1} [MFR Compat: Chococraft] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UD MineFactoryReloaded|CompatExtraBiomes{1.7.10R2.8.2B1} [MFR Compat: ExtraBiomes] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UD MineFactoryReloaded|CompatForestry{1.7.10R2.8.2B1} [MFR Compat: Forestry] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UD MineFactoryReloaded|CompatIC2{1.7.10R2.8.2B1} [MFR Compat: IC2] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UD MineFactoryReloaded|CompatProjRed{1.7.10R2.8.2B1} [MFR Compat ProjectRed] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UD MineFactoryReloaded|CompatRailcraft{1.7.10R2.8.2B1} [MFR Compat: Railcraft] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UD MineFactoryReloaded|CompatSufficientBiomes{1.7.10R2.8.2B1} [MFR Compat: Sufficient Biomes] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UD MineFactoryReloaded|CompatThaumcraft{1.7.10R2.8.2B1} [MFR Compat: Thaumcraft] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
UD MineFactoryReloaded|CompatTwilightForest{1.7.10R2.8.2B1} [MFR Compat: TwilightForest] (MineFactoryReloaded-[1.7.10]2.8.2B1-200.jar)
GL info: ' Vendor: 'Intel' Version: '4.0.0 - Build 10.18.10.3925' Renderer: 'Intel(R) HD Graphics'
CoFHCore: -[1.7.10]3.1.3-327
MineFactoryReloaded: -[1.7.10]2.8.2B1-200
ThermalFoundation: -[1.7.10]1.2.5-115
ThermalExpansion: -[1.7.10]4.1.4-247
RedstoneArsenal: -[1.7.10]1.1.2-92
Mantle Environment: DO NOT REPORT THIS CRASH! Unsupported mods in environment: optifine
TConstruct Environment: Environment healthy.
NetherOres: -[1.7.10]2.3.1-22
ThermalDynamics: -[1.7.10]1.2.0-171
OptiFine Version: OptiFine_1.7.10_HD_U_D6
Render Distance Chunks: 2
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
OpenGlVersion: 4.0.0 - Build 10.18.10.3925
OpenGlRenderer: Intel(R) HD Graphics
OpenGlVendor: Intel
CpuCount: 2

all mek downloads have to match. this is what is in the crash log.

Mekanism{8.1.9} [Mekanism] (Mekanism-1.7.10-8.1.9.265.jar)
MekanismGenerators{9.1.0} [MekanismGenerators] (MekanismGenerators-1.7.10-9.1.0.281.jar)
MekanismTools{9.1.0} [MekanismTools] (MekanismTools-1.7.10-9.1.0.281.jar)