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I tried adding the challenge pack in it crashed my game here the crash report.

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 11/11/14 8:58 AM
Description: Initializing game

java.lang.NoClassDefFoundError: cpw/mods/fml/common/ITickHandler
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:420)
at sun.reflect.GeneratedMethodAccessor4.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.loadMods(Loader.java:492)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:204)
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:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.common.ITickHandler
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 34 more
Caused by: java.lang.NullPointerException


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

-- Head --
Stacktrace:
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:420)
at sun.reflect.GeneratedMethodAccessor4.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.loadMods(Loader.java:492)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:204)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:480)

-- Initialization --
Details:
Stacktrace:
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:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.7.0_67, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 84530192 bytes (80 MB) / 330960896 bytes (315 MB) up to 1060372480 bytes (1011 MB)
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 v7.10.84.1219 Minecraft Forge 10.13.1.1219 Optifine OptiFine_1.7.10_HD_A4 124 mods loaded, 124 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed
FML{7.10.84.1219} [Forge Mod Loader] (forge-1.7.10-10.13.1.1219.jar) Unloaded->Constructed
Forge{10.13.1.1219} [Minecraft Forge] (forge-1.7.10-10.13.1.1219.jar) Unloaded->Constructed
accore{1.2.0} [AbyssalCraft Core] (AbyssalCraft-1.7.10-1.7.6.jar) Unloaded->Constructed
CodeChickenCore{1.0.4.29} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed
<CoFH ASM>{000} [CoFH ASM Data Initialization] (minecraft.jar) Unloaded->Constructed
NotEnoughItems{1.0.3.62} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.3.62-universal.jar) Unloaded->Constructed
OpenEye{0.6} [OpenEye] (OpenEye-0.6-1.7.10.jar) Unloaded->Constructed
PlayerAPI{1.1} [Player API] (minecraft.jar) Unloaded->Constructed
simplyjetpackscore{1.0} [Simply Jetpacks Coremod] (minecraft.jar) Unloaded->Constructed
VeinMiner_coremod{null_build-null} [Core mod] (minecraft.jar) Unloaded->Constructed
OpenModsCore{@[email protected]} [OpenModsCore] (minecraft.jar) Unloaded->Constructed
malisiscore{1.7.10-0.9.7} [Malisis Core] (malisiscore-1.7.10-0.9.7.jar) Unloaded->Constructed
FamiliarsAPI{1.7.10} [Familiars API] (FamiliarsAPI-1.7.10.jar) Unloaded->Constructed
lucky{5.1.0} [Lucky Block] ([1-7-10]_Lucky_Block_v5-1-0.jar) Unloaded->Constructed
doggytalents{v1.8.3a} [Doggy Talents] ([1.7.10] Doggy Talents - v1.8.3a) Unloaded->Constructed
FLabsBF{4.1.2} [Better Furnaces] ([1.7.10]Better_Furnaces_V4.1.2.jar) Unloaded->Constructed
DamageIndicatorsMod{3.2.0} [Damage Indicators] ([1.7.10]DamageIndicatorsMod-3.2.0.jar) Unloaded->Constructed
abyssalcraft{1.7.6} [AbyssalCraft] (AbyssalCraft-1.7.10-1.7.6.jar) Unloaded->Constructed
animalbikes{1.7.10} [Animal Bikes] (AnimalBikes_1.7.10.jar) Unloaded->Constructed
Artifacts{1.0.5} [Artifacts] (Artifacts-1.0.5.jar) Unloaded->Constructed
atum{0.6} [Atum] (Atum-1.7.10-0.6.30.jar) Unloaded->Constructed
Backpack{2.0.0} [Backpack] (backpack-2.0.0-1.7.x.jar) Unloaded->Constructed
iChunUtil{4.0.0} [iChunUtil] (iChunUtil-4.0.0(2).jar) Unloaded->Constructed
BackTools{4.0.0} [BackTools] (BackTools-4.0.0.jar) Unloaded->Constructed
BattleTowers{1.4.9} [Battle Towers] (BattleTowers-1.7.10.jar) Unloaded->Constructed
betterstorage{0.10.3.115} [BetterStorage] (BetterStorage-1.7.10-0.10.3.115.jar) Unloaded->Constructed
BiblioCraft{1.8.2} [BiblioCraft] (BiblioCraft[v1.8.2][MC1.7.10].jar) Unloaded->Constructed
blocklings{2.1.0} [Blocklings] (Blocklings-2.1.0-1.7.10.jar) Unloaded->Constructed
BuildCraft|Core{6.0.18} [BuildCraft] (buildcraft-6.0.18.jar) Unloaded->Constructed
BuildCraft|Builders{6.0.18} [BC Builders] (buildcraft-6.0.18.jar) Unloaded->Constructed
BuildCraft|Energy{6.0.18} [BC Energy] (buildcraft-6.0.18.jar) Unloaded->Constructed
BuildCraft|Factory{6.0.18} [BC Factory] (buildcraft-6.0.18.jar) Unloaded->Constructed
BuildCraft|Transport{6.0.18} [BC Transport] (buildcraft-6.0.18.jar) Unloaded->Constructed
BuildCraft|Silicon{6.0.18} [BC Silicon] (buildcraft-6.0.18.jar) Unloaded->Constructed
CarpentersBlocks{3.2.7} [Carpenter's Blocks] (Carpenters Blocks v3.2.7 - MC 1.7.10.zip) Unloaded->Constructed
kegare.caveworld{1.6.0} [Caveworld] (Caveworld_1.7.10-v1.6.0.jar) Unloaded->Constructed
chisel{1.5.7} [Chisel] (Chisel-1.7.10-1.5.7.jar) Unloaded->Constructed
CoFHCore{1.7.10R3.0.0B6} [CoFH Core] (CoFHCore-[1.7.10]3.0.0B6-32.jar) Unloaded->Constructed
BuildMod{v1.0} [Build Mod] (CoroUtil-1.1.jar) Unloaded->Constructed
CoroAI{v1.0} [CoroAI] (CoroUtil-1.1.jar) Unloaded->Constructed
ExtendedRenderer{v1.0} [Extended Renderer] (CoroUtil-1.1.jar) Unloaded->Constructed
ConfigMod{v1.0} [Extended Mod Config] (CoroUtil-1.1.jar) Unloaded->Constructed
props{1.11} [Decocraft] (Decocraft-v1.11_1.7.10.jar) Unloaded->Constructed
DragonMounts{r41-1.7.10} [Dragon Mounts] (DragonMounts-r41-1.7.10.jar) Unloaded->Constructed
dungeonpack{1.7.10-1.0} [Dungeon Pack] (dungeonpack-1.7.10-1.0.jar) Unloaded->Constructed
DynamicLights{1.3.5} [Dynamic Lights] (DynamicLights-1.7.10.jar) Unloaded->Constructed
DynamicLights_onFire{1.0.4} [Dynamic Lights Burning Entity Module] (DynamicLights-1.7.10.jar) Unloaded->Constructed
DynamicLights_creepers{1.0.4} [Dynamic Lights Creeper Module] (DynamicLights-1.7.10.jar) Unloaded->Constructed
DynamicLights_dropItems{1.0.7} [Dynamic Lights EntityItem Module] (DynamicLights-1.7.10.jar) Unloaded->Constructed
DynamicLights_entityClasses{1.0.1} [Dynamic Lights Entity Light Module] (DynamicLights-1.7.10.jar) Unloaded->Constructed
DynamicLights_mobEquipment{1.0.5} [Dynamic Lights Mob Equipment Light Module] (DynamicLights-1.7.10.jar) Unloaded->Constructed
DynamicLights_flameArrows{1.0.0} [Dynamic Lights Fiery Arrows Light Module] (DynamicLights-1.7.10.jar) Unloaded->Constructed
DynamicLights_floodLights{1.0.1} [Dynamic Lights Flood Light] (DynamicLights-1.7.10.jar) Unloaded->Constructed
DynamicLights_otherPlayers{1.0.7} [Dynamic Lights OtherPlayers Light Module] (DynamicLights-1.7.10.jar) Unloaded->Constructed
DynamicLights_thePlayer{1.1.3} [Dynamic Lights Player Light Module] (DynamicLights-1.7.10.jar) Unloaded->Constructed
eplus{1.7.10-3.0.1} [Enchanting Plus] (EnchantingPlus-1.7.10-3.0.1.jar) Unloaded->Constructed
EnderIO{1.7.10-2.0.8.221} [Ender IO] (EnderIO-1.7.10-2.0.8.221.jar) Unloaded->Constructed
EnderStorage{1.4.5.24} [EnderStorage] (EnderStorage-1.7.10-1.4.5.24-universal.jar) Unloaded->Constructed
ThermalFoundation{1.7.10R1.0.0B3} [Thermal Foundation] (ThermalFoundation-[1.7.10]1.0.0B3-8.jar) Unloaded->Constructed
ExtraUtilities{1.1.0k} [Extra Utilities] (extrautilities-1.1.0k.jar) Unloaded->Constructed
extvil{1.7.10-2.0} [Extended_Villages] (extvil-1.7.10-2.0.jar) Unloaded->Constructed
DefaultMobPack{1.7.10} [DefaultMobPack] (FamiliarsDefaultMobPack-1.7.10.jar) Unloaded->Constructed
ExtendedFamPack{1.7.10} [ExtendedFamPack] (FamiliarsExtendedFamPack-1.7.10.jar) Unloaded->Constructed
HerobrineFamPack{1.7.10} [HerobrineFamPack] (FamiliarsHerobrineFamPack-1.7.10.jar) Unloaded->Constructed
farlanders{1.2b} [The Farlanders] (farlanders-1.7.10-v1.2b.jar) Unloaded->Constructed
F2L{1.7.10b} [Flesh2Leather] (Flesh2Lether [1.7.10b].jar) Unloaded->Constructed
planetguy_Gizmos{3.0} [Gizmos] (Gizmos-3.0.jar) Unloaded->Constructed
Hats{4.0.1} [Hats] (Hats-4.0.1(1).jar) Unloaded->Constructed
headcrumbs{1.2.6} [Headcrumbs] (Headcrumbs-1.2.6.jar) Unloaded->Constructed
HostileWorlds{0.41} [Hostile Worlds] (Hostile Worlds v0.41 Alpha Mod for MC v1.6.4.zip) Unloaded
InfernalMobs{1.5.7} [Infernal Mobs] (InfernalMobs-1.7.10.jar) Unloaded
IronChest{6.0.54.737} [Iron Chest] (ironchest-1.7.10-6.0.54.737-universal.jar) Unloaded
ItFellFromTheSky{4.0.0} [ItFellFromTheSky] (ItFellFromTheSky-4.0.0.jar) Unloaded
ani_koto{v1.6} [Kingdoms of the Overworld Mod] (Kingdoms of the Overworld-1.7.10-1.6.jar) Unloaded
lycanitesmobs{1.10.5.1 - MC 1.7.10} [Lycanites Mobs] (LycanitesMobsComplete 1.10.5.1 [1.7.10].jar) Unloaded
arcticmobs{1.10.5.1 - MC 1.7.10} [Lycanites Arctic Mobs] (LycanitesMobsComplete 1.10.5.1 [1.7.10].jar) Unloaded
demonmobs{1.10.5.1 - MC 1.7.10} [Lycanites Demon Mobs] (LycanitesMobsComplete 1.10.5.1 [1.7.10].jar) Unloaded
desertmobs{1.10.5.1 - MC 1.7.10} [Lycanites Desert Mobs] (LycanitesMobsComplete 1.10.5.1 [1.7.10].jar) Unloaded
forestmobs{1.10.5.1 - MC 1.7.10} [Lycanites Forest Mobs] (LycanitesMobsComplete 1.10.5.1 [1.7.10].jar) Unloaded
freshwatermobs{1.10.5.1 - MC 1.7.10} [Lycanites Freshwater Mobs] (LycanitesMobsComplete 1.10.5.1 [1.7.10].jar) Unloaded
infernomobs{1.10.5.1 - MC 1.7.10} [Lycanites Inferno Mobs] (LycanitesMobsComplete 1.10.5.1 [1.7.10].jar) Unloaded
junglemobs{1.10.5.1 - MC 1.7.10} [Lycanites Jungle Mobs] (LycanitesMobsComplete 1.10.5.1 [1.7.10].jar) Unloaded
mountainmobs{1.10.5.1 - MC 1.7.10} [Lycanites Mountain Mobs] (LycanitesMobsComplete 1.10.5.1 [1.7.10].jar) Unloaded
plainsmobs{1.10.5.1 - MC 1.7.10} [Lycanites Plains Mobs] (LycanitesMobsComplete 1.10.5.1 [1.7.10].jar) Unloaded
saltwatermobs{1.10.5.1 - MC 1.7.10} [Lycanites Saltwater Mobs] (LycanitesMobsComplete 1.10.5.1 [1.7.10].jar) Unloaded
shadowmobs{1.10.5.1 - MC 1.7.10} [Lycanites Shadow Mobs] (LycanitesMobsComplete 1.10.5.1 [1.7.10].jar) Unloaded
swampmobs{1.10.5.1 - MC 1.7.10} [Lycanites Swamp Mobs] (LycanitesMobsComplete 1.10.5.1 [1.7.10].jar) Unloaded
more{4.0} [M-Ore mod] (M-Ore 4.0.jar) Unloaded
malisisdoors{1.7.10-1.1.4} [Malisis' Doors] (malisisdoors-1.7.10-1.1.4.jar) Unloaded
Mantle{1.7.10-0.3.1.jenkins180} [Mantle] (Mantle-mc1.7.10-0.3.1.jar) Unloaded
MobAmputation{4.0.0} [MobAmputation] (MobAmputation-4.0.0.jar) Unloaded
MobDismemberment{4.0.0} [MobDismemberment] (MobDismemberment-4.0.0.jar) Unloaded
mobsgun{1.0} [Mobs Gun] (Mobs-Gun-1.0.jar) Unloaded
modularpots{1.7.10.14} [Modular Flower Pots] (ModularPots-1.7.10.14.jar) Unloaded
Morph{0.9.1} [Morph] (Morph-Beta-0.9.1.jar) Unloaded
cfm{3.3.5} [§6MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.3.5(1.7.10).jar) Unloaded
OpenMods{0.6} [OpenMods] (OpenModsLib-1.7.10-0.6-snapshot-224.jar) Unloaded
OpenBlocks{1.3} [OpenBlocks] (OpenBlocks-1.7.10-1.3-snapshot-433.jar) Unloaded
pandorasbox{2.0.1} [Pandora's Box] (PandorasBox-2.0.1.jar) Unloaded
ParticleMan{v1.0} [Particle Man] (ParticleMan-1.0.jar) Unloaded
pixelmon{3.3.1} [Pixelmon] (Pixelmon-1.7.10-3.3.1-universal.jar) Unloaded
gibby_pun{1.5} [The Ultimate Pun Mod!] (PunMod 1.7.10-1.5.2.jar) Unloaded
rivalrebels{1.7.10A} [Rival Rebels] (rivalrebels-1.7.10A.jar) Unloaded
AS_Ruins{13.8} [Ruins Spawning System] (Ruins-1.7.10.jar) Unloaded
ThermalExpansion{1.7.10R4.0.0B5} [Thermal Expansion] (ThermalExpansion-[1.7.10]4.0.0B5-13.jar) Unloaded
simplyjetpacks{1.0.0} [Simply Jetpacks] (SimplyJetpacks-MC1.7.10-1.0.0.jar) Unloaded
SpecialMobs{3.0.2} [Special Mobs] (SpecialMobs-1.7.10-3.0.2.jar) Unloaded
TConstruct{1.7.10-1.7.1.build771} [Tinkers' Construct] (TConstruct-1.7.10-1.7.1c.jar) Unloaded
telepads{1.6.4 v5} [Teleportation Pads] (Telepads-1.7.2_1.7.jar) Unloaded
SpecialArmor{1.7.10} [TeeLuk's SpecialArmor] (TLSpecialArmor-1.7.10.jar) Unloaded
Torched{4.0.0} [Torched] (Torched-4.0.0.jar) Unloaded
bspkrsCore{6.14} [bspkrsCore] ([1.7.10]bspkrsCore-universal-6.14.jar) Unloaded
Treecapitator{1.7.2} [Treecapitator] (Tree-Capitator-Mod-1.7.2.jar) Unloaded
TwilightForest{2.3.2} [The Twilight Forest] (twilightforest-1.7.10-2.3.2.jar) Unloaded
AS_UpdateCheck{1.1.6} [AtomicStryker Update Check Mod] (UpdateCheckerMod-1.7.10.jar) Unloaded
VeinMiner{0.16.1} [Vein Miner] (Vein-Miner-Mod-1.7.10.jar) Unloaded
VeinMinerModSupport{0.16.1} [Mod Support] (Vein-Miner-Mod-1.7.10.jar) Unloaded
weaponmod{v1.14.3} [Balkon's WeaponMod] (weaponmod-1.14.3.jar) Unloaded
weather2{v2.3.6} [weather2] (Weather-2.3.6.jar) Unloaded
nolpfij_wildycraft{1.5.10} [Wildycraft] (wildycraft-1.7.2-1.5.10(1).jar) Unloaded
witchery{0.20.5} [Witchery] (witchery-1.7.10-0.20.5.jar) Unloaded
voxelmap{1.7.10} [VoxelMap No Radar] (Zans-MinimapNoRadar-Mod-1.7.10(1).jar) Unloaded
IguanaTweaksTConstruct{1.7.10-2.0.6} [Iguana Tinker Tweaks] (IguanaTinkerTweaks-1.7.10-2.0.6.jar) Unloaded
Launched Version: 1.7.10-Forge10.13.1.1219
LWJGL: 2.9.1
OpenGL: Intel(R) HD Graphics GL version 4.0.0 - Build 10.18.10.3496, Intel
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)