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Fastcraft is at the top of the report and suspect. There is a newer version available.

I also found this. At your discretion of course. https://www.reddit.com/r/hcfactions/comments/2os1t1/voila_togglesneak_v305_for_forge_1710/

---- Minecraft Crash Report ----
// There are four lights!

Time: 5/21/16 7:40 AM
Description: Rendering Block Entity

java.lang.NullPointerException: Rendering Block Entity
at net.minecraft.tileentity.MobSpawnerBaseLogic.func_98265_a(SourceFile:110)
at net.minecraft.tileentity.MobSpawnerBaseLogic.func_98281_h(SourceFile:236)
at net.minecraft.client.renderer.tileentity.TileEntityMobSpawnerRenderer.func_147517_a(SourceFile:20)
at net.minecraft.client.renderer.tileentity.TileEntityMobSpawnerRenderer.func_147500_a(SourceFile:15)
at net.minecraft.client.renderer.tileentity.TileEntityMobSpawnerRenderer.func_147500_a(SourceFile:10)
at net.minecraft.client.renderer.tileentity.TileEntityRendererDispatcher.func_147549_a(SourceFile:100)
at net.minecraft.client.renderer.tileentity.TileEntityRendererDispatcher.func_147544_a(SourceFile:92)
at net.minecraft.client.renderer.RenderGlobal.func_147589_a(RenderGlobal.java:772)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1596)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1334)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1001)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:898)
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)

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

-- Head --
Stacktrace:
at net.minecraft.tileentity.MobSpawnerBaseLogic.func_98265_a(SourceFile:110)
at net.minecraft.tileentity.MobSpawnerBaseLogic.func_98281_h(SourceFile:236)
at net.minecraft.client.renderer.tileentity.TileEntityMobSpawnerRenderer.func_147517_a(SourceFile:20)
at net.minecraft.client.renderer.tileentity.TileEntityMobSpawnerRenderer.func_147500_a(SourceFile:15)
at net.minecraft.client.renderer.tileentity.TileEntityMobSpawnerRenderer.func_147500_a(SourceFile:10)
at net.minecraft.client.renderer.tileentity.TileEntityRendererDispatcher.func_147549_a(SourceFile:100)

-- Block Entity Details --
Details:
Name: MobSpawner // net.minecraft.tileentity.TileEntityMobSpawner
Block type: ID #52 (tile.mobSpawner // net.minecraft.block.BlockMobSpawner)
Block data value: 0 / 0x0 / 0b0000
Block location: World: (-42,64,-40), Chunk: (at 6,4,8 in -3,-3; contains blocks -48,0,-48 to -33,255,-33), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Actual block type: ID #52 (tile.mobSpawner // net.minecraft.block.BlockMobSpawner)
Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
at net.minecraft.client.renderer.tileentity.TileEntityRendererDispatcher.func_147544_a(SourceFile:92)
at net.minecraft.client.renderer.RenderGlobal.func_147589_a(RenderGlobal.java:772)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1596)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1334)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['_Auto'/1792, l='MpServer', x=-0.35, y=68.62, z=5.38]]
Chunk stats: MultiplayerChunkCache: 417, 417
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (0,67,0), Chunk: (at 0,4,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 4551 game time, 4551 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: 57 total; [EntityClientPlayerMP['_Auto'/1792, l='MpServer', x=-0.35, y=68.62, z=5.38], EntitySkeleton['§4§6?2'/2181, l='MpServer', x=-66.35, y=16.00, z=16.30], EntityCreeper['Creeper'/1670, l='MpServer', x=-50.50, y=38.00, z=-40.50], EntitySkeleton['Skeleton'/1542, l='MpServer', x=65.50, y=15.00, z=-32.50], EntityZombie['Zombie'/1671, l='MpServer', x=-51.50, y=38.00, z=-40.50], EntityCreeper['Creeper'/2708, l='MpServer', x=52.50, y=15.00, z=65.50], EntityZombie['Zombie'/2709, l='MpServer', x=50.34, y=15.00, z=66.34], EntityCreeper['Creeper'/797, l='MpServer', x=73.03, y=14.00, z=-40.44], EntityZombie['Zombie'/1187, l='MpServer', x=-49.50, y=27.00, z=-15.50], EntitySkeleton['Skeleton'/1191, l='MpServer', x=-28.47, y=24.00, z=-45.84], EntityZombie['Zombie'/48, l='MpServer', x=-75.50, y=15.00, z=22.50], EntityCreeper['Creeper'/55, l='MpServer', x=-52.50, y=33.00, z=-51.06], EntityCreeper['§4§6?2'/56, l='MpServer', x=-55.50, y=32.00, z=-47.50], EntityWitch['Witch'/59, l='MpServer', x=-56.50, y=38.00, z=-42.50], EntityZombie['§4§6?2'/2363, l='MpServer', x=73.50, y=19.00, z=-5.50], EntityZombie['Zombie'/2493, l='MpServer', x=-78.38, y=44.00, z=45.01], EntityCreeper['Creeper'/62, l='MpServer', x=-53.72, y=64.00, z=-1.91], EntitySkeleton['Skeleton'/2622, l='MpServer', x=-24.50, y=19.00, z=69.50], EntityCreeper['Creeper'/63, l='MpServer', x=-53.34, y=64.00, z=-8.22], EntitySpider['Spider'/64, l='MpServer', x=-59.59, y=64.00, z=-6.66], EntitySkeleton['Skeleton'/65, l='MpServer', x=-61.50, y=18.00, z=9.50], EntityZombie['Zombie'/1991, l='MpServer', x=-70.50, y=15.00, z=36.50], EntityCow['Cow'/72, l='MpServer', x=-32.47, y=63.00, z=-36.53], EntityCow['Cow'/73, l='MpServer', x=-36.44, y=63.00, z=-35.38], EntityCow['Cow'/74, l='MpServer', x=-32.50, y=63.00, z=-33.53], EntityCreeper['§4§6?2'/2378, l='MpServer', x=-64.50, y=38.00, z=-44.50], EntityCow['Cow'/75, l='MpServer', x=-33.67, y=63.00, z=-34.86], EntitySheep['Sheep'/76, l='MpServer', x=-33.66, y=63.00, z=-36.19], EntityCreeper['Creeper'/1612, l='MpServer', x=-22.50, y=19.00, z=66.50], EntitySkeleton['Skeleton'/2124, l='MpServer', x=-77.50, y=17.00, z=57.50], EntityCow['Cow'/77, l='MpServer', x=-32.45, y=63.00, z=-35.45], EntityCreeper['Creeper'/845, l='MpServer', x=-76.50, y=17.00, z=57.50], EntityZombie['Zombie'/2125, l='MpServer', x=-76.50, y=17.00, z=56.50], EntityCreeper['Creeper'/2381, l='MpServer', x=-67.50, y=38.00, z=-43.50], EntityCow['Cow'/78, l='MpServer', x=-36.53, y=63.00, z=-36.53], EntitySpider['Spider'/721, l='MpServer', x=-73.50, y=38.00, z=-44.50], EntitySkeleton['Skeleton'/1618, l='MpServer', x=36.50, y=28.00, z=75.50], EntityCreeper['Creeper'/1619, l='MpServer', x=25.50, y=28.00, z=71.50], EntityZombie['Zombie'/1620, l='MpServer', x=26.50, y=28.00, z=68.50], EntitySheep['Sheep'/85, l='MpServer', x=31.28, y=68.00, z=13.91], EntityZombie['Zombie'/1621, l='MpServer', x=24.50, y=29.00, z=77.03], EntityChicken['Chicken'/88, l='MpServer', x=36.44, y=69.00, z=10.47], EntitySheep['Sheep'/89, l='MpServer', x=33.44, y=71.00, z=15.28], EntityChicken['Chicken'/90, l='MpServer', x=37.44, y=70.00, z=7.47], EntityChicken['Chicken'/92, l='MpServer', x=37.81, y=70.00, z=20.81], EntityZombie['§4§6?2'/1116, l='MpServer', x=-78.50, y=34.00, z=-31.50], EntityChicken['Chicken'/93, l='MpServer', x=37.19, y=70.00, z=20.31], EntityZombie['§b2'/1120, l='MpServer', x=-79.50, y=34.00, z=-34.50], EntitySkeleton['Skeleton'/1377, l='MpServer', x=5.50, y=37.00, z=77.50], EntityZombie['§b2'/1391, l='MpServer', x=19.50, y=41.00, z=72.50], EntityCreeper['Creeper'/1653, l='MpServer', x=-66.50, y=18.00, z=10.50], EntityCreeper['Creeper'/1654, l='MpServer', x=-55.00, y=24.00, z=4.59], EntitySkeleton['Skeleton'/1527, l='MpServer', x=-48.50, y=21.00, z=9.50], EntityCreeper['Creeper'/1785, l='MpServer', x=22.50, y=29.00, z=74.97], EntityCreeper['Creeper'/1786, l='MpServer', x=-75.50, y=60.00, z=61.50], EntityWitch['Witch'/1787, l='MpServer', x=-72.50, y=60.00, z=59.50], EntityCreeper['Creeper'/1789, l='MpServer', x=-74.50, y=60.00, z=57.50]]
Retry entities: 0 total; []
Server brand: CraftBukkit
Server type: Non-integrated multiplayer server
Stacktrace:
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2444)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:919)
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 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: 448186016 bytes (427 MB) / 634388480 bytes (605 MB) up to 1908932608 bytes (1820 MB)
Mod Pack: Unknown / None
LiteLoader Mods: 1 loaded mod(s)
- LiteAPI version 1.7.10_04
LaunchWrapper: 23 active transformer(s)
- Transformer: cpw.mods.fml.common.asm.transformers.PatchingTransformer
- Transformer: optifine.OptiFineClassTransformer
- 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: api.player.forge.PlayerAPITransformer
- Transformer: com.mumfrey.liteloader.transformers.event.EventProxyTransformer
- Transformer: com.mumfrey.liteloader.launch.LiteLoaderTransformer
- Transformer: com.mumfrey.liteloader.client.transformers.CrashReportTransformer
- Transformer: net.kohi.tcpnodelaymod.ClassTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.DeobfuscationTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.AccessTransformer
- Transformer: net.minecraftforge.transformers.ForgeAccessTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.ModAccessTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.ItemStackTransformer
- Transformer: fastcraft.J
- Transformer: cpw.mods.fml.common.asm.transformers.TerminalTransformer
- Transformer: com.mumfrey.liteloader.client.transformers.LiteLoaderEventInjectionTransformer
- Transformer: com.mumfrey.liteloader.client.transformers.MinecraftOverlayTransformer
- Transformer: net.spookysquad.spookster.injection.Transformer
- Transformer: com.mumfrey.liteloader.common.transformers.LiteLoaderPacketTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.ModAPITransformer
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -Xmx2G
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1558 Optifine OptiFine_1.7.10_HD_U_D4 8 mods loaded, 8 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJA FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1558-1.7.10.jar)
UCHIJA Forge{10.13.4.1558} [Minecraft Forge] (forge-1.7.10-10.13.4.1558-1.7.10.jar)
UCHIJA PlayerAPI{1.4} [Player API] (minecraft.jar)
UCHIJA FastCraft{1.22} [FastCraft] (fastcraft-1.22.jar)
UCHIJA LunatriusCore{1.1.2.21} [LunatriusCore] (LunatriusCore-1.7.10-1.1.2.21-universal.jar)
UCHIJA InGameInfoXML{2.8.1.81} [InGame Info XML] (InGameInfoXML-1.7.10-2.8.1.81-universal.jar)
UCHIJA ToggleSneak{3.0} [ToggleSneak] (ToggleSneak-(1.7.10)-v3.0.jar)
GL info: ' Vendor: 'ATI Technologies Inc.' Version: '4.5.13416 Compatibility Profile Context 15.300.1025.1001' Renderer: 'AMD Radeon R7 200 Series'
Launched Version: 1.7.10-Forge10.13.4.1558-1.7.10
LWJGL: 2.9.1
OpenGL: AMD Radeon R7 200 Series GL version 4.5.13416 Compatibility Profile Context 15.300.1025.1001, ATI Technologies Inc.
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: [32^2 ocn.zip]
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)
OptiFine Version: OptiFine_1.7.10_HD_U_D4
Render Distance Chunks: 5
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
OpenGlVersion: 4.5.13416 Compatibility Profile Context 15.300.1025.1001
OpenGlRenderer: AMD Radeon R7 200 Series
OpenGlVendor: ATI Technologies Inc.
CpuCount: 4