Minecraft Forums

So recently I made a mod pack for my youtube channel, and i played for a while on it. About a week later, without changing anything to the pack whenever I started a world it would crash the game with this message:

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 8/26/15 4:58 PM
Description: Unexpected error

java.lang.NoClassDefFoundError: net/minecraft/src/FMLRenderAccessLibrary
at GobBob.AnimatedBlocks.client.renderer.ABRenderBlocks.func_147805_b(ABRenderBlocks.java:449)
at GobBob.AnimatedBlocks.client.renderer.ABWorldRenderer.func_147892_a(ABWorldRenderer.java:246)
at GobBob.AnimatedBlocks.client.renderer.ABRenderGlobal.func_72716_a(ABRenderGlobal.java:1645)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1513)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1304)
at weather2.weathersystem.EntityRendererProxyWeather2Mini.func_78480_b(EntityRendererProxyWeather2Mini.java:50)
at net.minecraft.client.Minecraft.func_71411_J(Unknown Source)
at net.minecraft.client.Minecraft.func_99999_d(Unknown Source)
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.ClassNotFoundException: net.minecraft.src.FMLRenderAccessLibrary
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)
... 15 more

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

-- Head --
Stacktrace:
at GobBob.AnimatedBlocks.client.renderer.ABRenderBlocks.func_147805_b(ABRenderBlocks.java:449)
at GobBob.AnimatedBlocks.client.renderer.ABWorldRenderer.func_147892_a(ABWorldRenderer.java:246)
at GobBob.AnimatedBlocks.client.renderer.ABRenderGlobal.func_72716_a(ABRenderGlobal.java:1645)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1513)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1304)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['TheGamingBlock_Y'/168, l='MpServer', x=63.51, y=69.62, z=1017.40]]
Chunk stats: MultiplayerChunkCache: 9, 9
Level seed: 0
Level generator: ID 04 - BIOMESOP, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (36,64,1024), Chunk: (at 4,4,0 in 2,64; contains blocks 32,0,1024 to 47,255,1039), Region: (0,2; contains chunks 0,64 to 31,95, blocks 0,0,1024 to 511,255,1535)
Level time: 1389734 game time, 1329537 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 2 total; [EntityClientPlayerMP['TheGamingBlock_Y'/168, l='MpServer', x=63.51, y=69.62, z=1017.40], EntityHat['unknown'/202, l='MpServer', x=63.51, y=69.62, z=1017.40]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:373)
at net.minecraft.client.Minecraft.func_71396_d(Unknown Source)
at net.minecraft.client.Minecraft.func_99999_d(Unknown Source)
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)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 287913336 bytes (274 MB) / 700346368 bytes (667 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: 15, tallocated: 96
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1481 Optifine OptiFine_1.7.10_HD_C1 63 mods loaded, 63 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAAAA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAAAA FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1481-1.7.10.jar)
UCHIJAAAA Forge{10.13.4.1481} [Minecraft Forge] (forge-1.7.10-10.13.4.1481-1.7.10.jar)
UCHIJAAAA appliedenergistics2-core{rv2-stable-10} [AppliedEnergistics2 Core] (minecraft.jar)
UCHIJAAAA CodeChickenCore{1.0.7.46} [CodeChicken Core] (minecraft.jar)
UCHIJAAAA <CoFH ASM>{000} [CoFH ASM Data Initialization] (minecraft.jar)
UCHIJAAAA NotEnoughItems{1.0.5.110} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.5.110-universal.jar)
UCHIJAAAA VeinMiner_coremod{0.27.1_build.unknown} [Core mod] (minecraft.jar)
UCHIJAAAA OpenModsCore{0.8} [OpenModsCore] (minecraft.jar)
UCHIJAAAA battlegear2{1.7.10} [Mine & Blade Battlegear 2 - Bullseye] (1.7.10-MB_Battlegear2-Bullseye-1.0.8.0.jar)
UCHIJAAAA lucky{5.1.0} [Lucky Block] ([1-7-10]_Lucky_Block_v5-1-0.jar)
UCHIJAAAA securitycraft{v1.7.4.1} [SecurityCraft] ([1.7.10] SecurityCraft v1.7.4.1.jar)
UCHIJAAAA animatedblocks{v0.4 for 1.7.10} [Animated Blocks] (animatedblocks-0.4v_1.7.10.jar)
UCHIJAAAA appliedenergistics2{rv2-stable-10} [Applied Energistics 2] (appliedenergistics2-rv2-stable-10.jar)
UCHIJAAAA ArchimedesShips{1.7.2 v1.7.0} [Archimedes' Ships] (ArchimedesShips.jar)
UCHIJAAAA Backpack{2.0.0} [Backpack] (backpack-2.0.0-1.7.x.jar)
UCHIJAAAA BiomesOPlenty{2.1.0} [Biomes O' Plenty] (BiomesOPlenty-1.7.10-2.1.0.1387-universal.jar)
UCHIJAAAA CoFHCore{1.7.10R3.0.0B9} [CoFH Core] (CoFHCore-[1.7.10]3.0.0B9-40.jar)
UCHIJAAAA BuildCraft|Core{7.0.19} [BuildCraft] (buildcraft-7.0.19 (1).jar)
UCHIJAAAA BuildCraft|Silicon{7.0.19} [BC Silicon] (buildcraft-7.0.19 (1).jar)
UCHIJAAAA BuildCraft|Transport{7.0.19} [BC Transport] (buildcraft-7.0.19 (1).jar)
UCHIJAAAA BuildCraft|Builders{7.0.19} [BC Builders] (buildcraft-7.0.19 (1).jar)
UCHIJAAAA BuildCraft|Robotics{7.0.19} [BC Robotics] (buildcraft-7.0.19 (1).jar)
UCHIJAAAA BuildCraft|Energy{7.0.19} [BC Energy] (buildcraft-7.0.19 (1).jar)
UCHIJAAAA BuildCraft|Factory{7.0.19} [BC Factory] (buildcraft-7.0.19 (1).jar)
UCHIJAAAA CoroAI{v1.0} [CoroAI] (CoroUtil-1.0.jar)
UCHIJAAAA ExtendedRenderer{v1.0} [Extended Renderer] (CoroUtil-1.0.jar)
UCHIJAAAA ConfigMod{v1.0} [Extended Mod Config] (CoroUtil-1.0.jar)
UCHIJAAAA DamageIndicatorsMod{3.2.0} [Damage Indicators] (Damage-Indicators-Mod-1.7.10.jar)
UCHIJAAAA dimdoors{2.2.5-test} [Dimensional Doors] (DimensionalDoors-2.2.5-test8.jar)
UCHIJAAAA grim3212core{V0.2 - 1.7.10} [Grim3212 Core] (Grim3212-Core-1.7.10.jar)
UCHIJAAAA doubledoors{V0.1 - 1.7.10} [Double Doors] (Double-doors-mod-by-derbam-1.7.10.jar)
UCHIJAAAA flansmod{4.9.0} [Flan's Mod] (Flans Mod-1.7.10-4.9.0.jar)
UCHIJAAAA bspkrsCore{6.12} [bspkrsCore] ([1.7.10]bspkrsCore-universal-6.12.jar)
UCHIJAAAA FloatingRuins{1.7.10.r01} [FloatingRuins] (Floating-Ruins-Mod-1.7.10.jar)
UCHIJAAAA HardcoreEnderExpansion{1.8.3} [Hardcore Ender Expansion] (HardcoreEnderExpansion MC-1.7.10 v1.8.3.jar)
UCHIJAAAA iChunUtil{4.2.2} [iChunUtil] (iChunUtil-4.2.2.jar)
UCHIJAAAA Hats{4.0.0} [Hats] (Hats-Mod-1.7.10.jar)
UCHIJAAAA InfernalMobs{1.6.1} [Infernal Mobs] (InfernalMobs-1.7.10.jar)
UCHIJAAAA InventoryPets{1.1.2a} [Inventory Pets] (inventorypets-1.7.10-1.1.2a.jar)
UCHIJAAAA IronChest{6.0.60.741} [Iron Chest] (Iron-Chests-Mod-1.7.10.jar)
UCHIJAAAA Mantle{1.7.10-0.3.2.jenkins184} [Mantle] (Mantle-1.7.10-0.3.2.jar)
UCHIJAAAA RadixCore{2.0.2} [RadixCore] (RadixCore-2.0.2-1.7.10-universal.jar)
UCHIJAAAA MCA{1.7.10-5.0.7.2} [Minecraft Comes Alive] (MCA-1.7.10-5.0.7.2-universal.jar)
UCHIJAAAA numina{0.4.0.100} [Numina] (Numina-Mod-1.7.10.jar)
UCHIJAAAA powersuits{0.11.0.176} [MachineMuse's Modular Powersuits] (Modular-Powersuits-Mod-1.7.10.jar)
UCHIJAAAA morenetherores{1.1.2} [More Nether Ores] (MoreNetherOres-1.7.10-1.1.4.jar)
UCHIJAAAA Morph{0.9.2} [Morph] (Morph-Beta-0.9.2.jar)
UCHIJAAAA cfm{3.4.8} [§9MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.4.8(1.7.10).jar)
UCHIJAAAA ne{1.7.10-15.5-21-R1.0} [Nether Enhancements] (ne-1.7.10-15.5.21-R1.0.jar)
UCHIJAAAA OpenMods{0.8} [OpenMods] (OpenModsLib-1.7.10-0.8.jar)
UCHIJAAAA OpenBlocks{1.4.4} [OpenBlocks] (OpenBlocks-1.7.10-1.4.4.jar)
UCHIJAAAA OreSpawn{1.7.10.20.3} [OreSpawn] (orespawn-1.7.10-20.3 (1).zip)
UCHIJAAAA KoadPirates{For minecraft 1.7.2} [Koadmaster's Pirates] (Pirates-Mod-1.7.10.jar)
UCHIJAAAA PortalGun{4.0.0-beta-5} [PortalGun] (PortalGun-4.0.0-beta-5.jar)
UCHIJAAAA ReiMinimap{1.7.10} [Rei's Minimap] (Reis-Minimap-Mod-1.7.10.jar)
UCHIJAAAA Waila{1.5.10} [Waila] (Waila-1.5.10_1.7.10.jar)
UCHIJAAAA TConstruct{1.7.10-1.8.5.build957} [Tinkers' Construct] (TConstruct-1.7.10-1.8.5.jar)
UCHIJAAAA telepads{1.6.4 v5} [Teleportation Pads] (TelePads-Mod-1.7.10.jar)
UCHIJAAAA treasuremob{V0.1 - 1.7.10} [Treasure Mob] (Treasure-Chest-Mod-1.7.10.jar)
UCHIJAAAA VeinMiner{0.27.1_build.unknown} [Vein Miner] (VeinMiner-1.7.10_0.27.1.unknown.jar)
UCHIJAAAA VeinMinerModSupport{0.27.1_build.unknown} [Mod Support] (VeinMiner-1.7.10_0.27.1.unknown.jar)
UCHIJAAAA weather2{v2.3.4} [weather2] (Weather-2.3.4.jar)
GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.4.0' Renderer: 'GeForce GT 610/PCIe/SSE2'
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: stable rv2-stable-10 for Forge 10.13.2.1291
Mantle Environment: DO NOT REPORT THIS CRASH! Unsupported mods in environment: optifine
TConstruct Environment: Environment healthy.
Stencil buffer state: Function set: GL30, pool: internal, bits: 8
AE2 Integration: IC2:OFF, RotaryCraft:OFF, RC:OFF, BC:ON, RF:ON, RFItem:ON, MFR:OFF, DSU:OFF, FZ:OFF, FMP:OFF, RB:OFF, CLApi:OFF, Waila:ON, InvTweaks:OFF, NEI:ON, CraftGuide:OFF, Mekanism:OFF, ImmibisMicroblocks:OFF, BetterStorage:OFF
Launched Version: 1.7.10-Forge10.13.4.1481-1.7.10
LWJGL: 2.9.1
OpenGL: GeForce GT 610/PCIe/SSE2 GL version 4.4.0, NVIDIA Corporation
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)

Let me know if anyone knows how to fix this, because im not too good with crash reports.