I tried to play minecraft with mods and it said that I needed to have bookshelf to play, but when I downloaded bookshelf, my minecraft crashed.
cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: thehippomaster/MutantCreatures/MutantSkeleton
at cpw.mods.fml.common.LoadController.transition(LoadController.java:163)
at cpw.mods.fml.common.Loader.preinitializeMods(Loader.java:559)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:243)
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(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:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.NoClassDefFoundError: thehippomaster/MutantCreatures/MutantSkeleton
at thehippomaster.MutantCreatures.item.ChemicalX.(ChemicalX.java:83)
at thehippomaster.MutantCreatures.MutantCreatures.preInit(MutantCreatures.java:91)
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:532)
at sun.reflect.GeneratedMethodAccessor3.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.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(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.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.preinitializeMods(Loader.java:556)
... 10 more
Caused by: java.lang.ClassNotFoundException: thehippomaster.MutantCreatures.MutantSkeleton
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 38 more
Caused by: java.lang.NoClassDefFoundError: thehippomaster/AnimationAPI/IAnimatedEntity
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:182)
... 40 more
Caused by: java.lang.ClassNotFoundException: thehippomaster.AnimationAPI.IAnimatedEntity
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101)
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: 1.7.10
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 385265080 bytes (367 MB) / 1060372480 bytes (1011 MB) up to 1060372480 bytes (1011 MB)
Mod Pack: ERROR NullPointerException: null
LiteLoader Mods: ERROR NullPointerException: null
LaunchWrapper: 41 active transformer(s)
- Transformer: cpw.mods.fml.common.asm.transformers.PatchingTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.MarkerTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.SideTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.EventSubscriptionTransformer
- Transformer: net.minecraftforge.classloading.FluidIdTransformer
- Transformer: mods.battlegear2.coremod.transformers.EntityPlayerTransformer
- Transformer: mods.battlegear2.coremod.transformers.ModelBipedTransformer
- Transformer: mods.battlegear2.coremod.transformers.NetClientHandlerTransformer
- Transformer: mods.battlegear2.coremod.transformers.NetServerHandlerTransformer
- Transformer: mods.battlegear2.coremod.transformers.PlayerControllerMPTransformer
- Transformer: mods.battlegear2.coremod.transformers.ItemRendererTransformer
- Transformer: mods.battlegear2.coremod.transformers.MinecraftTransformer
- Transformer: mods.battlegear2.coremod.transformers.ItemInWorldTransformer
- Transformer: mods.battlegear2.coremod.transformers.EntityAIControlledByPlayerTransformer
- Transformer: mods.battlegear2.coremod.transformers.EntityOtherPlayerMPTransformer
- Transformer: mods.battlegear2.coremod.transformers.EntityTrackerTransformer
- Transformer: codechicken.lib.asm.ClassHeirachyManager
- Transformer: codechicken.core.asm.InterfaceDependancyTransformer
- Transformer: codechicken.core.asm.TweakTransformer
- Transformer: codechicken.core.asm.DelegatedTransformer
- Transformer: codechicken.core.asm.DefaultImplementationTransformer
- Transformer: codechicken.nei.asm.NEITransformer
- Transformer: com.mumfrey.liteloader.transformers.event.EventProxyTransformer
- Transformer: com.mumfrey.liteloader.launch.LiteLoaderTransformer
- Transformer: com.mumfrey.liteloader.client.transformers.CrashReportTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.DeobfuscationTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.AccessTransformer
- Transformer: net.minecraftforge.transformers.ForgeAccessTransformer
- Transformer: mods.battlegear2.coremod.transformers.BattlegearAccessTransformer
- Transformer: codechicken.core.asm.CodeChickenAccessTransformer
- Transformer: net.malisis.core.asm.MalisisCoreAccessTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.ModAccessTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.ItemStackTransformer
- Transformer: net.darkhax.bookshelf.asm.BookshelfTransformerManager
- Transformer: net.malisis.core.util.chunkcollision.ChunkCollisionTransformer
- Transformer: net.malisis.core.util.chunkblock.ChunkBlockTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.TerminalTransformer
- Transformer: com.mumfrey.liteloader.client.transformers.LiteLoaderEventInjectionTransformer
- Transformer: com.mumfrey.liteloader.client.transformers.MinecraftOverlayTransformer
- Transformer: com.mumfrey.liteloader.common.transformers.LiteLoaderPacketTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.ModAPITransformer
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
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 10.13.4.1614 48 mods loaded, 48 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCH mcp{9.05} Minecraft Coder Pack
UCH FML{7.10.99.99} Forge Mod Loader
UCH Forge{10.13.4.1614} Minecraft Forge
UCH CodeChickenCore{1.0.7.47} CodeChicken Core
UCH NotEnoughItems{1.0.5.120} Not Enough Items
UCH FamiliarsAPI{1.7.10} Familiars API
UCH battlegear2{1.0.5.6} Mine & Blade Battlegear 2 - Bullseye
UCH dungeonpack{1.7.10-1.0} [Dungeon Pack](14174895548_Dungeon-Pack-Mod-1.7.10 %281%29.jar)
UCH lucky{5.1.0} Lucky Block
UCH bspkrsCore{6.15} bspkrsCore
UCH Treecapitator{1.7.10} Treecapitator
UCH DamageIndicatorsMod{3.2.0} Damage Indicators
UCH pandorasbox{2.0.1} Pandora's Box
UCH animatedplayer{1.5.1} Animated Player Mod
UCH nevermine{2.3} AdventOfAscension
UCH gibby_dungeons{1.5} [Arcana RPG](Arcana RPG 1.5 - 1.7.10.jar)
UCH Backpack{2.0.1} Backpack
UCH iChunUtil{4.1.3} iChunUtil
UCH BackTools{4.0.0} BackTools
UCH bookshelf{1.0.4.172} Bookshelf
UCH cfm{3.4.8} §9MrCrayfish's Furniture Mod
UCH CustomPets{1.0.3} Custom Pets
UCH PTRModelLib{1.0.0} PTRModelLib
UCH props{2.2.1} Decocraft
UCH eplus{3.0.2-d} Enchanting Plus
UCH golems{1.20} Extra Golems
UCH DefaultMobPack{1.7.10} DefaultMobPack
UCH ExtendedFamPack{1.7.10} ExtendedFamPack
UCH HerobrineFamPack{1.7.10} HerobrineFamPack
UCH grim3212core{V0.2 - 1.7.10} Grim3212 Core
UCH Hats{4.0.1} Hats
UCH headcrumbs{1.7.4} Headcrumbs
UCH InfernalMobs{1.6.0} Infernal Mobs
UCH lootbags{2.0.8} Loot Bags
UCH malisiscore{1.7.10-0.14.3} MalisisCore
UCH malisisdoors{1.7.10-1.13.2} Malisis' Doors
UCH MobAmputation{4.0.1} MobAmputation
UCH MobDismemberment{4.0.0} MobDismemberment
UCH Morph{0.9.1} Morph
UCE MutantCreatures{1.4.9} Mutant Creatures
UCH mwaw{1.7.10-0.0.7} Elemental Witch Mod
UCH pokeball{V0.1 - 1.7.10} Pokeball
UCH RottenFleshToLeather{1.7.10-2.0} Rotten Flesh to Leather
UCH AS_Ruins{15.4} Ruins Spawning System
UCH telepads{1.0.0} [Telepads](Telepads 1.7.10 Full Release 3.1.jar)
UCH Torched{4.0.0} Torched
UCH AS_UpdateCheck{1.1.7} AtomicStryker Update Check Mod
UCH youtubers{1.8.0} Youtubers+ Mod
GL info: ' Vendor: 'Intel' Version: '4.3.0 - Build 20.19.15.4331' Renderer: 'Intel(R) HD Graphics 4600'

This is not a Bookshelf problem, this is a Mutant Creatures problem.

1.7.10 is not a supported version of Minecraft. This also appears to be more of an issue with Mutant Creatures or an ASM conflict. In either scenario there is nothing I can do to help you.