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I had installed Custom Spawner a few days ago, and everything worked fine, though I was still unfamiliar with the mod, and decided to play around with Cloning - I don't remember what exactly it was that I clicked when looking through the options for cloning, but as soon as I did click whatever it was, the specific world I was on keeps crashing - As soon as I log into the world, it will be loaded for a second, and then the screen suddenly turns grey and crashes. All my other worlds are playable except that one.

If anyone can help me, it'd make my day T_T

Here's the crash report below if that helps

----------------------------------------

---- Minecraft Crash Report ----
// Ooh. Shiny.

Time: 9/29/15 5:09 PM
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:483)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1224)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1015)
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)

-- 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: (-151,63,48), Chunk: (at 9,3,0 in -10,3; contains blocks -160,0,48 to -145,255,63), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
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_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:483)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1224)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['Coonley'/855, l='MpServer', x=-150.67, y=67.19, z=49.26]]
Chunk stats: MultiplayerChunkCache: 361, 361
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-128,64,220), Chunk: (at 0,4,12 in -8,13; contains blocks -128,0,208 to -113,255,223), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 2585637 game time, 1451435 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: true), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 74 total; [MoCEntityDragonfly['DragonFly'/896, l='MpServer', x=-247.52, y=65.00, z=-31.15], EntitySheep['Sheep'/768, l='MpServer', x=-88.50, y=69.00, z=111.50], EntitySheep['Sheep'/769, l='MpServer', x=-90.50, y=69.00, z=111.50], EntityCow['Cow'/773, l='MpServer', x=-76.50, y=69.00, z=111.50], EntityCow['Cow'/774, l='MpServer', x=-78.50, y=69.00, z=111.50], MoCEntityFirefly['Firefly'/914, l='MpServer', x=-240.59, y=67.00, z=-36.91], MoCEntityFirefly['Firefly'/915, l='MpServer', x=-242.15, y=66.12, z=-35.41], MoCEntityFly['Fly'/916, l='MpServer', x=-243.50, y=66.00, z=-34.50], EntityCow['Cow'/694, l='MpServer', x=-228.22, y=69.00, z=90.53], MoCEntityCricket['Cricket'/695, l='MpServer', x=-236.77, y=67.00, z=142.78], MoCEntityDragonfly['DragonFly'/696, l='MpServer', x=-227.56, y=68.00, z=142.09], MoCEntityBee['Bee'/697, l='MpServer', x=-225.84, y=67.00, z=159.77], EntityItem['item.item.dyePowder.black'/699, l='MpServer', x=-210.84, y=57.13, z=21.09], EntityItem['item.item.dyePowder.black'/700, l='MpServer', x=-211.75, y=57.13, z=19.31], EntityItem['item.item.dyePowder.black'/701, l='MpServer', x=-210.13, y=57.13, z=19.47], EntityItem['item.item.dyePowder.black'/702, l='MpServer', x=-208.94, y=57.13, z=20.16], EntityItem['item.item.egg'/703, l='MpServer', x=-213.56, y=98.13, z=23.13], EntityChicken['Chicken'/704, l='MpServer', x=-212.94, y=98.00, z=24.53], MoCEntityBee['Bee'/705, l='MpServer', x=-221.13, y=67.03, z=164.44], MoCEntityBee['Bee'/706, l='MpServer', x=-222.20, y=66.00, z=166.55], EntityClientPlayerMP['Coonley'/855, l='MpServer', x=-150.67, y=67.19, z=49.26], EntityItem['item.item.dyePowder.black'/727, l='MpServer', x=-115.22, y=52.13, z=42.19], EntityItem['item.item.dyePowder.black'/728, l='MpServer', x=-116.94, y=52.13, z=44.81], EntityItem['item.item.dyePowder.black'/729, l='MpServer', x=-113.78, y=52.13, z=40.81], MoCEntityFirefly['Firefly'/858, l='MpServer', x=-139.69, y=90.00, z=-14.59], EntityChicken['Chicken'/730, l='MpServer', x=-115.06, y=64.00, z=80.78], EntityItem['item.item.egg'/859, l='MpServer', x=-194.88, y=108.13, z=3.50], EntityChicken['Chicken'/731, l='MpServer', x=-116.22, y=64.00, z=80.78], EntityChicken['Chicken'/860, l='MpServer', x=-187.54, y=102.38, z=-2.50], EntityChicken['Chicken'/732, l='MpServer', x=-114.59, y=64.00, z=82.41], EntityChicken['Chicken'/733, l='MpServer', x=-115.63, y=64.00, z=80.78], EntityChicken['Chicken'/734, l='MpServer', x=-113.78, y=64.00, z=80.78], EntitySheep['Sheep'/863, l='MpServer', x=-136.44, y=65.00, z=-29.47], EntityChicken['Chicken'/735, l='MpServer', x=-117.78, y=64.00, z=82.31], MoCEntityFirefly['Firefly'/864, l='MpServer', x=-140.81, y=90.00, z=-23.31], EntityChicken['Chicken'/736, l='MpServer', x=-118.47, y=64.00, z=80.78], MoCEntityFirefly['Firefly'/865, l='MpServer', x=-139.50, y=90.00, z=-18.50], EntityChicken['Chicken'/737, l='MpServer', x=-116.78, y=64.00, z=80.78], MoCEntityMaggot['Maggot'/866, l='MpServer', x=-141.80, y=91.00, z=-19.15], EntityChicken['Chicken'/738, l='MpServer', x=-120.47, y=64.00, z=80.78], EntityChicken['Chicken'/739, l='MpServer', x=-119.47, y=64.00, z=80.78], EntityChicken['Chicken'/868, l='MpServer', x=-223.53, y=87.00, z=-0.38], EntityItem['item.item.egg'/740, l='MpServer', x=-115.34, y=64.13, z=81.19], EntityChicken['Chicken'/869, l='MpServer', x=-212.50, y=103.00, z=-1.50], EntityItem['item.item.egg'/741, l='MpServer', x=-118.88, y=64.13, z=81.38], EntityItem['item.item.egg'/870, l='MpServer', x=-209.41, y=105.13, z=-0.47], EntityItem['item.item.egg'/742, l='MpServer', x=-116.75, y=64.13, z=81.44], EntityPig['Pig'/745, l='MpServer', x=-100.47, y=66.00, z=73.47], EntityPig['Pig'/746, l='MpServer', x=-101.40, y=66.00, z=74.69], EntityChicken['Chicken'/875, l='MpServer', x=-211.53, y=82.00, z=-22.28], EntityPig['Pig'/747, l='MpServer', x=-102.53, y=66.00, z=73.47], EntityPig['Pig'/748, l='MpServer', x=-100.47, y=66.00, z=77.16], EntityPig['Pig'/749, l='MpServer', x=-102.53, y=66.00, z=75.26], EntityChicken['Chicken'/878, l='MpServer', x=-79.63, y=62.37, z=-13.91], EntityPig['Pig'/750, l='MpServer', x=-100.47, y=66.00, z=75.76], EntityPig['Pig'/751, l='MpServer', x=-101.56, y=66.00, z=76.46], EntityPig['Pig'/752, l='MpServer', x=-102.51, y=66.00, z=78.17], EntityPig['Pig'/753, l='MpServer', x=-100.47, y=66.00, z=79.63], EntityPig['Pig'/754, l='MpServer', x=-101.19, y=66.00, z=78.38], EntityPig['Pig'/755, l='MpServer', x=-102.55, y=66.00, z=79.25], EntityPig['Pig'/756, l='MpServer', x=-102.53, y=66.00, z=82.09], MoCEntityMaggot['Maggot'/885, l='MpServer', x=-243.50, y=64.00, z=-12.31], EntityPig['Pig'/757, l='MpServer', x=-100.47, y=66.00, z=83.53], EntityPig['Pig'/758, l='MpServer', x=-102.23, y=66.00, z=80.47], MoCEntityButterfly['ButterFly'/887, l='MpServer', x=-187.38, y=75.00, z=-55.38], EntityPig['Pig'/759, l='MpServer', x=-100.47, y=66.00, z=81.92], MoCEntityButterfly['ButterFly'/888, l='MpServer', x=-189.69, y=76.00, z=-51.59], EntityPig['Pig'/760, l='MpServer', x=-101.56, y=66.00, z=83.16], EntityPig['Pig'/761, l='MpServer', x=-101.03, y=66.00, z=80.77], EntityCow['Cow'/764, l='MpServer', x=-80.50, y=69.00, z=111.50], EntityCow['Cow'/765, l='MpServer', x=-82.84, y=69.00, z=111.50], EntitySheep['Sheep'/766, l='MpServer', x=-84.50, y=69.00, z=111.50], MoCEntitySnail['Snail'/895, l='MpServer', x=-244.56, y=64.00, z=-14.22], EntitySheep['Sheep'/767, l='MpServer', x=-86.50, y=69.00, z=111.50]]
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(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 7 (amd64) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 145346728 bytes (138 MB) / 412508160 bytes (393 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: 13, tallocated: 95
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1448 6 mods loaded, 6 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-1.7.10-10.13.4.1448-1.7.10.jar)
UCHIJAAAA Forge{10.13.4.1448} [Minecraft Forge] (forge-1.7.10-10.13.4.1448-1.7.10.jar)
UCHIJAAAA CustomSpawner{3.3.0} [DrZhark's CustomSpawner] (CustomMobSpawner 3.3.0.zip)
UCHIJAAAA customnpcs{1.7.10d} [CustomNpcs] (CustomNPCs_1.7.10d.jar)
UCHIJAAAA MoCreatures{6.3.1} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.3.1.zip)
GL info: ' Vendor: 'Intel' Version: '3.1.0 - Build 9.17.10.4229' Renderer: 'Intel(R) HD Graphics 3000'
Launched Version: 1.7.10-Forge10.13.4.1448-1.7.10
LWJGL: 2.9.1
OpenGL: Intel(R) HD Graphics 3000 GL version 3.1.0 - Build 9.17.10.4229, 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: [MassiveCraft-V9.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)