Hi, I am trying to create a modpack. But I think mekanism just crashed with modtweaker 2.
Here's the crash report:
---- Minecraft Crash Report ----
// Ooh. Shiny.

Time: 10/11/16 7:25 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: mekanism/common/recipe/machines/SolarEvaporationRecipe
at cpw.mods.fml.common.LoadController.transition(LoadController.java:163)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:739)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:311)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:552)
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)
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 org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:310)
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:395)
at org.multimc.EntryPoint.listen(EntryPoint.java:170)
at org.multimc.EntryPoint.main(EntryPoint.java:54)
Caused by: java.lang.NoClassDefFoundError: mekanism/common/recipe/machines/SolarEvaporationRecipe
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
at java.lang.Class.privateGetPublicMethods(Unknown Source)
at java.lang.Class.getMethods(Unknown Source)
at stanhebben.zenscript.type.ZenTypeNative.complete(ZenTypeNative.java:157)
at minetweaker.runtime.GlobalRegistry.registerNativeClass(GlobalRegistry.java:95)
at minetweaker.MineTweakerAPI.registerClass(MineTweakerAPI.java:340)
at modtweaker2.mods.mekanism.Mekanism.(Mekanism.java:48)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at modtweaker2.utils.TweakerPlugin.load(TweakerPlugin.java:18)
at modtweaker2.utils.TweakerPlugin.register(TweakerPlugin.java:12)
at modtweaker2.ModTweaker2.init(ModTweaker2.java:73)
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:532)
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.initializeMods(Loader.java:737)
... 18 more
Caused by: java.lang.ClassNotFoundException: mekanism.common.recipe.machines.SolarEvaporationRecipe
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 60 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: 1.7.10
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_101, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 2605166304 bytes (2484 MB) / 4065853440 bytes (3877 MB) up to 4065853440 bytes (3877 MB)
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xms2048m -Xmx4096m
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 10.13.4.1566 171 mods loaded, 164 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHI mcp{9.05} Minecraft Coder Pack
UCHI FML{7.10.99.99} Forge Mod Loader
UCHI Forge{10.13.4.1566} Minecraft Forge
UCHI appliedenergistics2-core{rv3-beta-6} Applied Energistics 2 Core
UCHI CodeChickenCore{1.0.7.46} CodeChicken Core
UCHI ivtoolkit{IvToolkit} 1.2
UCHI NotEnoughItems{1.0.5.111} Not Enough Items
UCHI OpenComputers|Core{1.5.22.46} OpenComputers (Core)
UCHI OpenEye{0.6} OpenEye
UCHI ThE-core{1.0.0.1} Thaumic Energistics Core
UCHI ThaumicTinkerer-preloader{0.1} Thaumic Tinkerer Core
UCHI OpenModsCore{0.9.1} OpenModsCore
UCHI {000} CoFH ASM
UCHI FastCraft{1.23} FastCraft
UCHI AccidentallyCircumstantialEvents{1.12.10} Accidentally Circumstantial Events
UCHI AgriCraft{1.7.10-1.5.0} AgriCraft
UCHI aobdbb{1.0.6} Another One Bites The Dust: Berry Bushes
UCHI AppleCore{1.3.2} AppleCore
UCHI appliedenergistics2{rv3-beta-6} Applied Energistics 2
UCHI CoFHCore{1.7.10R3.1.3} CoFH Core
UCHI MineFactoryReloaded{1.7.10R2.8.1} MineFactory Reloaded
UCHI Baubles{1.0.1.10} Baubles
UCHI Thaumcraft{4.2.3.5} Thaumcraft
UCHI MineFactoryReloaded|CompatThaumcraft{1.7.10R2.8.1} MFR Compat: Thaumcraft
UCHI Waila{1.5.10} Waila
UCHI Automagy{0.28.2} Automagy
UCHI Backpack{2.0.1} Backpack
UCHI betterquesting{1.0.155} Better Questing
UCHI BiblioCraft{1.11.5} BiblioCraft
UCHI Mantle{1.7.10-0.3.2.jenkins184} Mantle
UCHI Natura{2.2.0} Natura
UCHI BiomesOPlenty{2.1.0} Biomes O' Plenty
UCHI BiblioWoodsBoP{1.9} BiblioWoods Biomes O'Plenty Edition
UCHI HardcoreEnderExpansion{1.8.6} [Hardcore Ender Expansion](HardcoreEnderExpansion MC-1.7.10 v1.8.6.jar)
UCHI Forestry{4.2.15.63} Forestry for Minecraft
UCHI BiblioWoodsForestry{1.7} BiblioWoods Forestry Edition
UCHI BiblioWoodsNatura{1.5} BiblioWoods Natura Edition
UCHI AWWayofTime{v1.3.3} Blood Magic: Alchemical Wizardry
UCHI Botania{r1.8-249} [Botania](Botania r1.8-249.jar)
UCHI BrandonsCore{1.0.0.12} Brandon's Core
UCHI BuildCraft|Core{7.1.18} BuildCraft
UCHI BuildCraft|Transport{7.1.18} BC Transport
UCHI BuildCraft|Silicon{7.1.18} BC Silicon
UCHI BuildCraft|Energy{7.1.18} BC Energy
UCHI BuildCraft|Factory{7.1.18} BC Factory
UCHI BuildCraft|Builders{7.1.18} BC Builders
UCHI BuildCraft|Robotics{7.1.18} BC Robotics
UCHI ThermalFoundation{1.7.10R1.2.5} Thermal Foundation
UCHI ThermalExpansion{1.7.10R4.1.4} Thermal Expansion
UCHI BuildCraft|Compat{7.1.5} BuildCraft Compat
UCHI Railcraft{9.12.2.0} Railcraft
UCHI ForgeMultipart{1.2.0.347} Forge Multipart
UCHI chisel{2.4.1.40} Chisel 2
UCHI CarpentersBlocks{3.3.8.1} [Carpenter's Blocks](Carpenter's Blocks v3.3.8.1 - MC 1.7.10.jar)
UCHI ctmlib{1.0.1.5} CTMLib
UCHI ComputerCraft{1.75} ComputerCraft
UCHI EnderStorage{1.4.7.36} EnderStorage
UCHI MrTJPCoreMod{1.1.0.33} MrTJPCore
UCHI ProjRed|Core{4.7.0pre12.95} ProjectRed Core
UCHI ProjRed|Transmission{4.7.0pre12.95} ProjectRed Transmission
UCHI OpenComputers{1.5.22.46} OpenComputers
UCHI CompactMachines{1.7.10-1.21} Compact Machines
UCHI customitems{1.0.8b} Custom Items
UCHI CustomMainMenu{1.9.2} Custom Main Menu
UCHI customnpcs{1.7.10c} CustomNpcs
UCHI DraconicEvolution{1.0.2h} Draconic Evolution
UCHI Enchiridion{1.3} [Enchiridion](Enchiridion 2-1.7.10-2.0.2a.jar)
UCHI Enchiridion2{2.0.2a} [Enchiridion 2](Enchiridion 2-1.7.10-2.0.2a.jar)
UCHI Mekanism{9.1.0} Mekanism
UCHI EnderIO{1.7.10-2.2.8.381} Ender IO
UCHI extracells{2.3.14} Extra Cells 2
UCHI ImmersiveEngineering{0.7.7} Immersive Engineering
UCHI TConstruct{1.7.10-1.8.8.build988} Tinkers' Construct
UCHI ExtraUtilities{1.2.10} Extra Utilities
UCHI ThaumicTinkerer{unspecified} Thaumic Tinkerer
UCHI ForbiddenMagic{1.7.10-0.575} [Forbidden Magic](Forbidden Magic-1.7.10-0.575.jar)
UCHI MineTweaker3{3.0.9B} MineTweaker 3
UCHI FTBL{1.0.18.2} FTBLib
UCHI FTBT{1.0.2} FTB Tweaks
UCHI FTBU{1.0.18.2} FTBUtilities
UCHI iChunUtil{4.2.2} iChunUtil
UCHI GraviGun{4.0.0-beta} GraviGun
UCHI guideapi{1.7.10-1.0.1-20} Guide-API
UCHI Hats{4.0.1} Hats
UCHI HatStand{4.0.0} HatStand
UCHI HardcoreQuesting{4.4.4} [Hardcore Questing Mode](HQM-The Journey-4.4.4.jar)
UCHI inventorytweaks{1.59-dev-152-cf6e263} Inventory Tweaks
UCHI IronChest{6.0.60.741} Iron Chest
UCHI JABBA{1.2.2} JABBA
UCHI journeymap{@Jmversion@} JourneyMap
UCHI LoreExp{1.0.5} Lore Expansion
UCHI MekanismGenerators{9.1.0} MekanismGenerators
UCHI MekanismTools{9.1.0} MekanismTools
UCHI MineFactoryReloaded|CompatAppliedEnergistics{1.7.10R2.8.1} MFR Compat: Applied Energistics
UCHI MineFactoryReloaded|CompatBuildCraft{1.7.10R2.8.1} MFR Compat: BuildCraft
UCHI MineFactoryReloaded|CompatForestry{1.7.10R2.8.1} MFR Compat: Forestry
UCHI MineFactoryReloaded|CompatForgeMicroblock{1.7.10R2.8.1} MFR Compat: ForgeMicroblock
UCHI ProjRed|Exploration{4.7.0pre12.95} ProjectRed Exploration
UCHI MineFactoryReloaded|CompatProjRed{1.7.10R2.8.1} MFR Compat ProjectRed
UCHI MineFactoryReloaded|CompatRailcraft{1.7.10R2.8.1} MFR Compat: Railcraft
UCHI MineFactoryReloaded|CompatThermalExpansion{1.7.10R2.8.1} MFR Compat: Thermal Expansion
UCHI MineFactoryReloaded|CompatTConstruct{1.7.10R2.8.1} MFR Compat: Tinkers' Construct
UCHI MineFactoryReloaded|CompatVanilla{1.7.10R2.8.1} MFR Compat: Vanilla
UCHE modtweaker2{0.9.6} Mod Tweaker 2
UCHI Morph{0.9.2} Morph
UCHI NEIAddons{1.12.13.38} NEI Addons
UCHI NEIAddons|Developer{1.12.13.38} NEI Addons: Developer Tools
UCHI NEIAddons|AppEng{1.12.13.38} NEI Addons: Applied Energistics 2
UCHI NEIAddons|Botany{1.12.13.38} NEI Addons: Botany
UCHI NEIAddons|Forestry{1.12.13.38} NEI Addons: Forestry
UCHI NEIAddons|CraftingTables{1.12.13.38} NEI Addons: Crafting Tables
UCHI NEIAddons|ExNihilo{1.12.13.38} NEI Addons: Ex Nihilo
UCHI neiintegration{1.1.2} NEI Integration
UCHI NetherOres{1.7.10R2.3.1} Nether Ores
UCHI bq_npc_integration{1.0.10} NPC Integration
UCHI NuclearCraft{1.9d} NuclearCraft
UCHI OpenMods{0.9.1} OpenMods
UCHI OpenBlocks{1.5.1} OpenBlocks
UCHI OpenPeripheralCore{1.3} OpenPeripheralCore
UCHI OpenPeripheral{0.5.1} OpenPeripheralAddons
UCHI OpenPeripheralIntegration{0.5} OpenPeripheralIntegration
UCHI harvestcraft{1.7.10j} [Pam's HarvestCraft](Pam's HarvestCraft 1.7.10Lb.jar)
UCHI PortalGun{4.0.0-beta-5} PortalGun
UCHI Progression{0.3.5} Progression
UCHI ProjRed|Integration{4.7.0pre12.95} ProjectRed Integration
UCHI ProjRed|Fabrication{4.7.0pre12.95} ProjectRed Fabrication
UCHI ProjRed|Illumination{4.7.0pre12.95} ProjectRed Illumination
UCHI ProjRed|Expansion{4.7.0pre12.95} ProjectRed Expansion
UCHI ProjRed|Transportation{4.7.0pre12.95} ProjectRed Transportation
UCHI qCraft{1.7.10-1.2.2} qCraft
UCHI RandomThings{2.2.4} Random Things
UCHI reccomplex{0.9.7.1} Recurrent Complex
UCHI RedstoneArsenal{1.7.10R1.1.2} Redstone Arsenal
UCHI bq_rf{1.0.13} RF Expansion
UCHI Sanguimancy{1.7.10-1.1.9-35} Sanguimancy
UCHI SpiceOfLife{1.3.6} The Spice of Life
UCHI bq_standard{1.0.99} Standard Expansion
UCHI StevesFactoryManager{A93} Steve's Factory Manager
UCHI StevesAddons{0.10.16} Steve's Addons
UCHI StevesCarts{2.0.0.b18} Steve's Carts 2
UCHI StevesWorkshop{0.5.1} Steve's Workshop
UCHI Sync{4.0.0} Sync
UCHI thaumcraftneiplugin{@Version@} Thaumcraft NEI Plugin
UCHI thaumicenergistics{1.0.0.5} Thaumic Energistics
UCHI ThaumicHorizons{1.1.9} Thaumic Horizons
UCHI ThermalDynamics{1.7.10R1.2.0} Thermal Dynamics
UCHI TiCTooltips{1.2.5} TiC Tooltips
UCHI TMechworks{0.2.14.100} Tinkers' Mechworks
UCHI TML{4.0.1} TooMuchLoot
UCHI WailaHarvestability{1.1.2} Waila Harvestability
UCHI wawla{1.3.3} What Are We Looking At
UCHI WR-CBE|Core{1.4.1.9} WR-CBE Core
UCHI WR-CBE|Addons{1.4.1.9} WR-CBE Addons
UCHI WR-CBE|Logic{1.4.1.9} WR-CBE Logic
UCHI XaeroMinimap{1.10.9} Xaero's Minimap
UCHI Ztones{1.7.10} Ztones
UCHI ForgeMicroblock{1.2.0.347} Forge Microblocks
UCHI McMultipart{1.2.0.347} Minecraft Multipart Plugin
UCHI ForgeRelocation{0.0.1.4} ForgeRelocation
UCHI MCFrames{1.0} MCFrames
UCHI RelocationFMP{0.0.1.2} RelocationFMP
UCHI aobd{2.9.2} Another One Bites The Dust
UCHI denseores{1.0} Dense Ores
UCHI HungerOverhaul{1.7.10-1.0.0.jenkins75} Hunger Overhaul
UD MineFactoryReloaded|CompatAtum{1.7.10R2.8.1} MFR Compat: Atum
UD MineFactoryReloaded|CompatBackTools{1.7.10R2.8.1} MFR Compat: BackTools
UD MineFactoryReloaded|CompatChococraft{1.7.10R2.8.1} MFR Compat: Chococraft
UD MineFactoryReloaded|CompatExtraBiomes{1.7.10R2.8.1} MFR Compat: ExtraBiomes
UD MineFactoryReloaded|CompatIC2{1.7.10R2.8.1} MFR Compat: IC2
UD MineFactoryReloaded|CompatSufficientBiomes{1.7.10R2.8.1} MFR Compat: Sufficient Biomes
UD MineFactoryReloaded|CompatTwilightForest{1.7.10R2.8.1} MFR Compat: TwilightForest
GL info: ' Vendor: 'Intel' Version: '4.3.0 - Build 10.18.14.4414' Renderer: 'Intel(R) HD Graphics 4600'
OpenModsLib class transformers: [stencil_patches:FINISHED],[movement_callback:FINISHED],[map_gen_fix:FINISHED],[gl_capabilities_hook:FINISHED],[player_render_hook:FINISHED]
Class transformer null safety: all safe
AE2 Version: beta rv3-beta-6 for Forge 10.13.4.1448
CoFHCore: -[1.7.10]3.1.3-327
MineFactoryReloaded: -[1.7.10]2.8.1-174
Mantle Environment: Environment healthy.
ThermalFoundation: -[1.7.10]1.2.5-115
ThermalExpansion: -[1.7.10]4.1.4-247
TConstruct Environment: Environment healthy.
NetherOres: -[1.7.10]2.3.1-22
RedstoneArsenal: -[1.7.10]1.1.2-92
ThermalDynamics: -[1.7.10]1.2.0-171
Stencil buffer state: Function set: GL30, pool: forge, bits: 8

I am having the same trouble.
I receive an error with Waila and Mekanism-1.7.10-9.1.0.281 when trying to start my server.
It seems to be an issue on Mekanism's side, with the Solar Evaporation Controller. (class)
Note: I also receive a similar error with "Mod Tweaker 2" as OP @nathan72419

Waila Error Report Below:

22.10 04:49:38 [Server] Server thread/INFO [WAILA Plugins]: Sorting plugins. After: [Mekanism, IFluidHandler, TE Augments, Railcraft, MFR, DSU, Forestry, Extra Utilities, Pam's Fruit]
22.10 04:49:38 [Server] Server thread/FATAL [WAILA Plugins]: Plugin Mekanism threw an error on init. Skipping...
22.10 04:49:38 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: java.lang.NoClassDefFoundError: mekanism/common/tile/TileEntitySolarEvaporationController
22.10 04:49:38 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at tterrag.wailaplugins.plugins.PluginMekanism.load(PluginMekanism.java:36)

Mod Tweaker Error Report Below:

22.10 04:56:18 [Server] Server thread/INFO [modtweaker2]: Starting Initialization for modtweaker2
22.10 04:56:20 [Server] Server thread/INFO [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: java.lang.NoClassDefFoundError: mekanism/common/recipe/machines/SolarEvaporationRecipe

Report this to ModTweaker.