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"There was a severe problem during mod loading that has caused the game to fail" Hello, I really need help on this type of errors that keep happening when adding mods:
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---- Minecraft Crash Report ----
// There are four lights!

Time: 3/19/14 4:26 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: Oneric/MNC/client/MNCRenderPlayerBase
at cpw.mods.fml.common.LoadController.transition(LoadController.java:156)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:523)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:183)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:473)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:808)
at net.minecraft.client.main.Main.main(SourceFile:101)
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:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
Caused by: java.lang.NoClassDefFoundError: Oneric/MNC/client/MNCRenderPlayerBase
at Oneric.MNC.client.ClientProxyMNC.initRenderPlayerAPI(ClientProxyMNC.java:110)
at Oneric.MNC.common.mod_netherbr.preLoad(mod_netherbr.java:252)
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:545)
at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
at com.google.common.eventbus.EventBus.post(EventBus.java:267)
at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:201)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:181)
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.EventHandler.handleEvent(EventHandler.java:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
at com.google.common.eventbus.EventBus.post(EventBus.java:267)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:112)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:522)
... 10 more
Caused by: java.lang.ClassNotFoundException: Oneric.MNC.client.MNCRenderPlayerBase
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 38 more
Caused by: java.lang.NoClassDefFoundError: api/player/render/RenderPlayerBase
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:178)
... 40 more
Caused by: java.lang.ClassNotFoundException: api.player.render.RenderPlayerBase
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:97)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 44 more


A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows XP (x86) version 5.1
Java Version: 1.7.0_51, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode, sharing), Oracle Corporation
Memory: 85146792 bytes (81 MB) / 306950144 bytes (292 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v8.11 FML v6.4.49.965 Minecraft Forge 9.11.1.965 99 mods loaded, 99 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized
FML{6.4.49.965} [Forge Mod Loader] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized
Forge{9.11.1.965} [Minecraft Forge] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized
FamiliarsAPI{1.6.4} [Familiars API] (Familiars_API_1.6.4a) Unloaded->Constructed->Pre-initialized
DamageIndicatorsMod{2.9.2.3} [Damage Indicators] (1.6.4 DamageIndicatorsv2.9.2.3) Unloaded->Constructed->Pre-initialized
SC0_CondensedPotions{1.0.4} [Condensed Potions] ([1.6.4] Condensed Potions 1.0.4 (1)) Unloaded->Constructed->Pre-initialized
SC0_SpaceCore{0.6.2} [SpaceCore] ([1.6.4] SpaceCore 0.6.2) Unloaded->Constructed->Pre-initialized
SC0_MorePotionTypes{1.0.1} [More Potion Types] ([1.6.4] More Potion Types 1.0.1) Unloaded->Constructed->Pre-initialized
powerGems{0.2.5} [Power Gems] ([1.6.4] Power Gems 0.2.5) Unloaded->Constructed->Pre-initialized
SC0_UsefulPets{1.1.6} [Useful Pets] ([1.6.4] Useful Pets 1.1.6) Unloaded->Constructed->Pre-initialized
bspkrsCore{v5.3(1.6.4)} [bspkrsCore] ([1.6.4]bspkrsCorev5.3) Unloaded->Constructed->Pre-initialized
craftableAnimals{2.3.1} [Craftable Animals] ([1.6.4]CraftableAnimals v2.3.1) Unloaded->Constructed->Pre-initialized
TreeCapitator{Forge 1.6.4.r09} [Treecapitator] ([1.6.4]TreeCapitator.Forge.1.6.4.r09.Universal) Unloaded->Constructed->Pre-initialized
AencEx{0.0.1} [AencEx] ([1.6.x]Alpha MoreEnchantments V 8.2) Unloaded->Constructed->Pre-initialized
MoreEnchantments{0.1.3} [More Player Enchantments] ([1.6.x]Alpha MoreEnchantments V 8.2) Unloaded->Constructed->Pre-initialized
cfm{3.2.6} [§4MrCrayfish's Furniture Mod] ([Forge]FurnitureModv3.2.6(1.6.4)) Unloaded->Constructed->Pre-initialized
ccm{1.0.1} [MrCrayfish's Construction Mod] ([Forge]MrCrayfishConstructionModv1.0.5 (1.6.4)) Unloaded->Constructed->Pre-initialized
shinoow.abyssalcraft{1.5.0c} [AbyssalCraft] (AbyssalCraft-1.5.0c-mc1-6-4) Unloaded->Constructed->Pre-initialized
intarray.beacon{1.0.0 for 1.6.4} [Aesthetic Beacons Mod] (Aesthetic Beacons Texture Fix 1.0.0 (MC 1.6.4)) Unloaded->Constructed->Pre-initialized
mod_Invedit{version 1.16 by mister_person} [mod_Invedit] (All-U-Want inventory editor 1.17) Unloaded->Constructed->Pre-initialized
KeithyUtils{1.2} [Keithy Utils] (KeithyUtils-1.6.4-1.2.16) Unloaded->Constructed->Pre-initialized
Aquaculture{1.2.4} [Aquaculture] (Aquaculture_1.2.4) Unloaded->Constructed->Pre-initialized
ArchimedesShipsMod{1.6.4 v1.4.5} [Archimedes' Ships] (ArchimedesShips) Unloaded->Constructed->Pre-initialized
Backpack{1.26.29} [Backpack] (backpack-1.26.29-1.6.x) Unloaded->Constructed->Pre-initialized
BattleTowers{1.4.2} [Battle Towers] (BattleTowers_1.6.4) Unloaded->Constructed->Pre-initialized
QuiverMod{1.6.2} [Better Archery] (Better_Archery_1.6.3_for_1.6.4) Unloaded->Constructed->Pre-initialized
BetterDungeons{2.4} [Chocolate quest] (BetterDungeons208) Unloaded->Constructed->Pre-initialized
bettervillages{0.2} [Better Villages Mod] (BetterVillages_0.2(1.6.4)) Unloaded->Constructed->Pre-initialized
BiblioCraft{1.4.0} [BiblioCraft] (BiblioCraft[v1.4.0]) Unloaded->Constructed->Pre-initialized
AWWayofTime{v0.7.2} [Blood Magic: Alchemical Wizardry] (Blood Magic v0.7.2a) Unloaded->Constructed->Pre-initialized
BuildCraft|Core{4.2.2} [BuildCraft] (buildcraft-A-1.6.4-4.2.2) Unloaded->Constructed->Pre-initialized
BuildCraft|Builders{4.2.2} [BC Builders] (buildcraft-A-1.6.4-4.2.2) Unloaded->Constructed->Pre-initialized
BuildCraft|Energy{4.2.2} [BC Energy] (buildcraft-A-1.6.4-4.2.2) Unloaded->Constructed->Pre-initialized
BuildCraft|Factory{4.2.2} [BC Factory] (buildcraft-A-1.6.4-4.2.2) Unloaded->Constructed->Pre-initialized
BuildCraft|Transport{4.2.2} [BC Transport] (buildcraft-A-1.6.4-4.2.2) Unloaded->Constructed->Pre-initialized
BuildCraft|Silicon{4.2.2} [BC Silicon] (buildcraft-A-1.6.4-4.2.2) Unloaded->Constructed->Pre-initialized
colourfulPortalsMod{1.3.2} [Colourful Portals Mod] (ColourfulPortals_v.1.3.2_for_1.6.4) Unloaded->Constructed->Pre-initialized
craftguide{1.5.2} [CraftGuide] (CraftGuide-1.6.7.4) Unloaded->Constructed->Pre-initialized
customnpcs{1.6.4} [CustomNpcs] (CustomNPCs_1.6.2-1.6.4) Unloaded->Constructed->Pre-initialized
CyanSwords{1.9.0} [Cyan Warrior Swords] (Cyan_Warrior_Swords_Mod_v.1.9.0) Unloaded->Constructed->Pre-initialized
DungeonPack{1.6.4} [DungeonPack] (DungeonPack 1.6.4) Unloaded->Constructed->Pre-initialized
eplus{1.16.5b} [Enchanting Plus] (EnchantingPlus-1.16.5) Unloaded->Constructed->Pre-initialized
ExtrabiomesXL{3.14.5} [ExtrabiomesXL] (ExtrabiomesXL-universal-1.6.4-3.14.5) Unloaded->Constructed->Pre-initialized
ExtraUtilities{1.0.1} [Extra Utilities] (extrautils-1.0.2) Unloaded->Constructed->Pre-initialized
FamiliarsDefaultMobPack{1.6.4} [Familiars DefaultMobPack] (Familiars_DefaultMobPack_1.6.4a) Unloaded->Constructed->Pre-initialized
FamiliarsExtendedFamPack{1.6.4} [Familiars ExtendedFamPack] (Familiars_ExtendedFamPack_1.6.4a) Unloaded->Constructed->Pre-initialized
FamiliarsHerobrineFamPack{1.6.4} [Familiars HerobrineFamPack] (Familiars_HerobrineFamPack_1.6.4a) Unloaded->Constructed->Pre-initialized
guilib{1.0.6.1} [GUI Library] (Forge_GuiLibv1.0.6.1) Unloaded->Constructed->Pre-initialized
NBTEdit{1.6.4.0} [In-game NBTEdit] (Forge_NBTEditv1.6.4.0) Unloaded->Constructed->Pre-initialized
CARuins{0.1.3} [Cellular Automata Generator] (Generator_mods_0.1.3(1.6.X)) Unloaded->Constructed->Pre-initialized
GreatWallMod{0.1.3} [Great Wall Mod] (Generator_mods_0.1.3(1.6.X)) Unloaded->Constructed->Pre-initialized
WalledCityMod{0.1.3} [Walled City Generator] (Generator_mods_0.1.3(1.6.X)) Unloaded->Constructed->Pre-initialized
golemworld{@VERSION@} [Golem World] (GolemWorld) Unloaded->Constructed->Pre-initialized
instahouse{[1.6.4] Insta House v 5.3} [Insta House] (Insta House v 5.3) Unloaded->Constructed->Pre-initialized
levelup{0.3} [Level Up!] (LevelUp!-0.3(1.6.X)) Unloaded->Constructed->Pre-initialized
lucky{4.2.1} [Lucky Block] (LuckyBlock_v4.2.1_1.6.4) Unloaded->Constructed->Pre-initialized
Magical Foods Mod{2.1} [Magical Foods Mod] (Magical Foods Mod 2.1) Unloaded->Constructed->Pre-initialized
magicalcrops{3.1.6} [Magical Crops] (magical_crops_1.6.4_3.1.6) Unloaded->Constructed->Pre-initialized
mca{3.5.4} [Minecraft Comes Alive] (MCA v3.5.4) Unloaded->Constructed->Pre-initialized
Metallurgy3Core{3.2.3} [Metallurgy 3 Core] (Metallurgy-1.6.4-3.3.2) Unloaded->Constructed->Pre-initialized
Metallurgy3Base{3.2.3} [Metallurgy 3 Base] (Metallurgy-1.6.4-3.3.2) Unloaded->Constructed->Pre-initialized
Metallurgy3Machines{3.2.3} [Metallurgy 3 Machines] (Metallurgy-1.6.4-3.3.2) Unloaded->Constructed->Pre-initialized
Metallurgy3Vanilla{3.2.3} [Metallurgy 3 Vanilla] (Metallurgy-1.6.4-3.3.2) Unloaded->Constructed->Pre-initialized
numina{0.1.2-55} [Numina] (Numina-1.6.2-0.1.2-55) Unloaded->Constructed->Pre-initialized
powersuits{0.10.0-91} [MachineMuse's Modular Powersuits] (ModularPowersuits-1.6.4-0.10.0-91) Unloaded->Constructed->Pre-initialized
MoreSwordsMod{2.6.0} [More Swords Mod] (More Swords Mod 2.6.0 For 1.6.4) Unloaded->Constructed->Pre-initialized
Morph{0.6.0} [Morph] (Morph-Beta-0.6.0) Unloaded->Constructed->Pre-initialized
MysticRuins{0.1} [Mystic Ruins] (MysticRuins_0.1(1.6.X)) Unloaded->Constructed->Pre-initialized
Natura{2.1.14} [Natura] (Natura_mc1.6.X_2.1.14) Unloaded->Constructed->Errored
NaturalAbsorption{1.2} [Natural Absorption] (NaturalAbsorption 1.2 for MC 1.6.4) Unloaded->Constructed->Pre-initialized
NatureOverhaul{0.5} [Nature Overhaul] (NatureOverhaul_0.5(1.6.X)) Unloaded->Constructed->Pre-initialized
NetherX{1.2.2} [NetherX] (NetherX 1.2 for MC 1.6.4) Unloaded->Constructed->Pre-initialized
newdungeons{1.6.4} [New Dungeons] (NewDungeons_1.6.4) Unloaded->Constructed->Pre-initialized
OreSpawn{164.13} [OreSpawn] (orespawn164v13) Unloaded->Constructed->Pre-initialized
potionblade{1.3} [Potion Blades] (Potion_Blade_1.3) Unloaded->Constructed->Pre-initialized
powersuitaddons{@VERSION@} [Andrew's Modular Powersuits Addons] (powersuitaddons-1.6.4-884) Unloaded->Constructed->Pre-initialized
quiverchevsky{b31} [QuiverBow] (QuiverBow_1.6.4_b31) Unloaded->Constructed->Pre-initialized
Roguelike{1.3.0} [Roguelike Dungeons] (roguelike-v1.3.0-forge-1.6.4) Unloaded->Constructed->Pre-initialized
RopesPlus{1.5.3} [Ropes+] (RopePlus_1.6.4) Unloaded->Constructed->Pre-initialized
rpginventorymod{1.6.4} [RPG Inventory Mod] (RpgInventory 1.6.4 v3 Complete) Unloaded->Constructed->Pre-initialized
RPGMS{RpgInv8.4} [RpgInv Mage Addon] (RpgInventory 1.6.4 v3 Complete) Unloaded->Constructed->Pre-initialized
RPGPlusPlus{RpgInv8.4} [Subarakis RPG++ mod] (RpgInventory 1.6.4 v3 Complete) Unloaded->Constructed->Pre-initialized
RPGRB{RpgInv8.4} [Rogue and BeastMaster Patch] (RpgInventory 1.6.4 v3 Complete) Unloaded->Constructed->Pre-initialized
VanillaShields{RpgInv8.4} [Vanilla Shields Mod] (RpgInventory 1.6.4 v3 Complete) Unloaded->Constructed->Pre-initialized
secretroomsmod{4.6.2} [The SecretRoomsMod] (SecretRoomsMod-universal-1.6.4-4.6.2.323) Unloaded->Constructed->Pre-initialized
SlimevoidLib{2.0.3.1} [Slimevoid Library] (SlimevoidLib-Universal-v2.0.3.1 (MC1.6.4)) Unloaded->Constructed->Pre-initialized
TLSpecialArmor{1.6.4} [SpecialArmor] (SpecialArmor_1.6.4a) Unloaded->Constructed->Pre-initialized
SpecialMobs{2.6} [Special Mobs] (SpecialMobs 2.6 for MC 1.6.2) Unloaded->Constructed->Pre-initialized
TooMuchTNT{2.6} [TooMuchTNT] (TooMuchTNT v2.6) Unloaded->Constructed->Pre-initialized
TwilightForest{1.20.3} [The Twilight Forest] (twilightforest-1.20.3) Unloaded->Constructed->Pre-initialized
onerics_mnc{1.8.6} [The Ultimate Nether Mod] (UltimateNether_V.1.8.6_MC.1.6.4) Unloaded->Constructed->Errored
AS_UpdateCheck{1.1.1} [AtomicStryker Update Check Mod] (UpdateCheckerMod_1.6.4) Unloaded->Constructed->Pre-initialized
UtilityMobs{2.1} [Utility Mobs] (UtilityMobs 2.1 for MC 1.6.2) Unloaded->Constructed->Pre-initialized
VeinMiner{0.12.2} [Vein Miner] (VeinMiner.0.12.2_MC1.6) Unloaded->Constructed->Pre-initialized
weaponmod{1.6.2 v1.13.6} [Balkon's WeaponMod] (WeaponMod) Unloaded->Constructed->Pre-initialized
wildcaves3{0.4.3.5} [Wild Caves 3] (WildCaves3-0.4.3.5) Unloaded->Constructed->Pre-initialized
WirelessRedstoneCore{1.7.1.4} [Wireless Redstone] (WirelessRedstoneCore-Universal-v1.7.1.4_MC1.6) Unloaded->Constructed->Pre-initialized
mod_ZanMinimap{0.9.4} [Zan's Minimap] (ZansMinimap1.6.4) Unloaded->Constructed->Pre-initialized
MSC2{1.1.0} [Mob Spawn Controls 2] (Forge_MSC2v1.1.0) Unloaded->Constructed->Pre-initialized
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I download many mods and this type crash report always annoy me, at least tell me a legible description of the problem, so please help me and I would appreciate it if you would give me a solution. Thank you!