MInecraft keeps crashing while trying to play on modded worl

So...i started a 1.9 survival UNMODDED awhile ago and i decided recently to add mods to it but the mods were for 1.7.10 so i had to downgrade the world to 1.7.10 (which i dont know if that is the problem) but now when ever i walk around and explore my game will just freeze then show a random color and then crash....and ive tried taking out the mods then loading back into world but it still happens i think it got corrupted its starting to get annoying and i just wanna play my world so if anyone knows how to fix it or if its even fixable please help me out thanks oh ya and heres the crash report:

---- Minecraft Crash Report ----
// My bad.

Time: 22/04/16 8:22 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:762)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1556)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1304)
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: (-304,31,394), Chunk: (at 0,1,10 in -19,24; contains blocks -304,0,384 to -289,255,399), 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:762)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1556)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['SansBadTem'/375, l='MpServer', x=-352.55, y=38.62, z=356.96]]
Chunk stats: MultiplayerChunkCache: 210, 219
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-393,60,360), Chunk: (at 7,3,8 in -25,22; contains blocks -400,0,352 to -385,255,367), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 419795 game time, 111437 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: 91 total; [EntitySkeleton['Skeleton'/256, l='MpServer', x=-335.50, y=41.00, z=353.50], EntitySheep['Sheep'/128, l='MpServer', x=-432.06, y=67.00, z=376.13], EntitySpider['Spider'/257, l='MpServer', x=-330.00, y=68.00, z=363.41], EntityBat['Bat'/258, l='MpServer', x=-335.03, y=38.07, z=370.91], EntitySheep['Sheep'/259, l='MpServer', x=-325.53, y=74.83, z=377.47], EntitySheep['Sheep'/260, l='MpServer', x=-321.50, y=73.00, z=371.28], EntityZombie['Zombie'/261, l='MpServer', x=-332.50, y=67.00, z=368.84], EntityBat['Bat'/262, l='MpServer', x=-327.52, y=48.98, z=399.57], EntitySpider['Spider'/142, l='MpServer', x=-427.28, y=70.94, z=292.66], EntityZombie['Zombie'/143, l='MpServer', x=-419.50, y=70.00, z=303.50], EntityZombie['Zombie'/144, l='MpServer', x=-417.66, y=70.00, z=304.34], EntityZombie['Zombie'/145, l='MpServer', x=-422.66, y=70.00, z=304.34], EntityZombie['Zombie'/146, l='MpServer', x=-425.66, y=70.00, z=305.34], EntityZombie['Zombie'/147, l='MpServer', x=-422.50, y=70.00, z=306.50], EntityCreeper['Creeper'/148, l='MpServer', x=-416.50, y=70.00, z=342.50], EntityCow['Cow'/149, l='MpServer', x=-420.41, y=63.00, z=428.25], EntityCow['Cow'/150, l='MpServer', x=-424.41, y=64.00, z=426.53], EntitySkeleton['Skeleton'/279, l='MpServer', x=-314.50, y=20.00, z=298.50], EntityCow['Cow'/151, l='MpServer', x=-422.53, y=65.00, z=431.50], EntitySheep['Sheep'/280, l='MpServer', x=-312.63, y=73.00, z=362.09], EntitySkeleton['Skeleton'/281, l='MpServer', x=-314.50, y=73.00, z=357.50], EntityCreeper['Creeper'/282, l='MpServer', x=-307.50, y=30.00, z=402.50], EntityCreeper['Creeper'/283, l='MpServer', x=-305.50, y=51.00, z=409.50], EntityPig['Pig'/284, l='MpServer', x=-310.50, y=70.00, z=404.50], EntityPig['Pig'/285, l='MpServer', x=-311.41, y=70.00, z=406.13], EntitySheep['Sheep'/157, l='MpServer', x=-410.47, y=69.21, z=315.39], EntityPig['Pig'/286, l='MpServer', x=-314.31, y=70.00, z=413.29], EntitySheep['Sheep'/158, l='MpServer', x=-402.81, y=71.00, z=319.28], EntitySkeleton['Skeleton'/159, l='MpServer', x=-408.50, y=70.00, z=310.50], EntitySkeleton['Skeleton'/160, l='MpServer', x=-411.50, y=70.00, z=339.50], EntityPainting['Painting'/161, l='MpServer', x=-406.50, y=62.50, z=357.06], EntityPainting['Painting'/162, l='MpServer', x=-406.50, y=62.50, z=363.94], EntitySkeleton['Skeleton'/163, l='MpServer', x=-400.53, y=64.00, z=422.94], EntitySheep['Sheep'/295, l='MpServer', x=-298.31, y=70.00, z=297.50], EntityPainting['Painting'/168, l='MpServer', x=-389.06, y=62.00, z=364.50], EntitySkeleton['Skeleton'/296, l='MpServer', x=-289.50, y=70.00, z=313.50], EntityZombie['Zombie'/297, l='MpServer', x=-292.66, y=40.00, z=366.34], EntityPainting['Painting'/169, l='MpServer', x=-389.06, y=62.00, z=356.50], EntityPig['Pig'/298, l='MpServer', x=-289.50, y=70.00, z=383.72], EntityBat['Bat'/299, l='MpServer', x=-302.51, y=19.02, z=390.25], EntityBat['Bat'/300, l='MpServer', x=-297.88, y=19.00, z=392.26], EntityPig['Pig'/301, l='MpServer', x=-296.56, y=70.00, z=389.53], EntityPig['Pig'/302, l='MpServer', x=-299.50, y=71.00, z=391.50], EntityPig['Pig'/303, l='MpServer', x=-297.84, y=70.00, z=388.53], EntitySkeleton['Skeleton'/304, l='MpServer', x=-297.50, y=71.00, z=394.50], EntitySpider['Spider'/305, l='MpServer', x=-294.63, y=71.00, z=397.88], EntityZombie['Zombie'/306, l='MpServer', x=-295.50, y=71.00, z=394.50], EntityBat['Bat'/307, l='MpServer', x=-299.48, y=42.00, z=415.31], EntityPig['Pig'/308, l='MpServer', x=-303.69, y=70.00, z=409.41], EntitySpider['Spider'/180, l='MpServer', x=-376.36, y=68.14, z=281.86], EntityZombie['Zombie'/181, l='MpServer', x=-382.50, y=63.00, z=386.38], EntityCreeper['Creeper'/182, l='MpServer', x=-371.50, y=67.00, z=400.72], EntityBat['Bat'/316, l='MpServer', x=-285.83, y=60.00, z=279.25], EntitySheep['Sheep'/317, l='MpServer', x=-278.50, y=75.00, z=298.28], EntitySheep['Sheep'/318, l='MpServer', x=-274.50, y=72.00, z=305.72], EntitySheep['Sheep'/319, l='MpServer', x=-279.81, y=72.00, z=304.66], EntitySkeleton['Skeleton'/320, l='MpServer', x=-283.50, y=64.00, z=355.50], EntityBat['Bat'/327, l='MpServer', x=-275.62, y=56.00, z=289.75], EntityPainting['Painting'/168, l='MpServer', x=-389.06, y=62.00, z=364.50], EntityPainting['Painting'/169, l='MpServer', x=-389.06, y=62.00, z=356.50], EntityZombie['Zombie'/207, l='MpServer', x=-360.34, y=53.00, z=365.53], EntityZombie['Zombie'/208, l='MpServer', x=-364.00, y=52.00, z=361.66], EntityZombie['Zombie'/209, l='MpServer', x=-359.30, y=49.00, z=359.50], EntityZombie['Zombie'/210, l='MpServer', x=-360.29, y=50.00, z=359.50], EntityCreeper['Creeper'/211, l='MpServer', x=-365.69, y=53.00, z=362.31], EntityZombie['Zombie'/212, l='MpServer', x=-358.50, y=53.00, z=364.63], EntityZombie['Zombie'/213, l='MpServer', x=-364.16, y=52.00, z=360.41], EntitySpider['Spider'/214, l='MpServer', x=-362.75, y=64.00, z=358.25], EntityPainting['Painting'/161, l='MpServer', x=-406.50, y=62.50, z=357.06], EntitySkeleton['Skeleton'/215, l='MpServer', x=-363.56, y=53.00, z=366.22], EntityPainting['Painting'/162, l='MpServer', x=-406.50, y=62.50, z=363.94], EntitySheep['Sheep'/216, l='MpServer', x=-358.94, y=64.00, z=356.53], EntityCreeper['Creeper'/217, l='MpServer', x=-364.41, y=54.00, z=367.94], EntityCreeper['Creeper'/218, l='MpServer', x=-362.50, y=58.00, z=382.31], EntitySkeleton['Skeleton'/219, l='MpServer', x=-362.34, y=59.00, z=389.28], EntitySheep['Sheep'/220, l='MpServer', x=-355.53, y=76.00, z=400.72], EntityBat['Bat'/229, l='MpServer', x=-336.07, y=17.00, z=278.57], EntityBat['Bat'/231, l='MpServer', x=-336.25, y=17.00, z=289.80], EntitySheep['Sheep'/232, l='MpServer', x=-337.69, y=61.59, z=333.16], EntitySkeleton['Skeleton'/233, l='MpServer', x=-346.50, y=71.00, z=328.50], EntityZombie['Zombie'/234, l='MpServer', x=-351.38, y=54.00, z=361.47], EntityEnderman['Enderman'/235, l='MpServer', x=-349.16, y=54.00, z=361.53], EntitySheep['Sheep'/236, l='MpServer', x=-338.72, y=68.00, z=365.50], EntitySkeleton['Skeleton'/237, l='MpServer', x=-342.50, y=29.00, z=377.50], EntitySkeleton['Skeleton'/238, l='MpServer', x=-344.50, y=35.00, z=382.50], EntityBat['Bat'/239, l='MpServer', x=-347.13, y=34.54, z=384.38], EntityChicken['Chicken'/241, l='MpServer', x=-341.53, y=46.00, z=387.63], EntitySheep['Sheep'/242, l='MpServer', x=-343.50, y=71.00, z=385.28], EntityClientPlayerMP['SansBadTem'/375, l='MpServer', x=-352.55, y=38.62, z=356.96], EntityBat['Bat'/254, l='MpServer', x=-319.54, y=24.00, z=284.34], EntitySkeleton['Skeleton'/255, l='MpServer', x=-329.04, y=67.00, z=311.50]]
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 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: 271740016 bytes (259 MB) / 524554240 bytes (500 MB) up to 3207856128 bytes (3059 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 11, 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_C1 14 mods loaded, 14 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-1.7.10-10.13.4.1558-1.7.10.jar)
UCHIJAAAA Forge{10.13.4.1558} [Minecraft Forge] (forge-1.7.10-10.13.4.1558-1.7.10.jar)
UCHIJAAAA CodeChickenCore{1.0.4.29} [CodeChicken Core] (minecraft.jar)
UCHIJAAAA ivtoolkit{1.2.1} [IvToolkit] (minecraft.jar)
UCHIJAAAA NotEnoughItems{1.0.3.74} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.3.74-universal.jar)
UCHIJAAAA mod_ThreadedLighting{1.7.10-1.0} [Threaded Lighting] (minecraft.jar)
UCHIJAAAA gilded-games-util{1.7.10-1.2} [Gilded Games Utility] (gilded-games-util-1.7.10-1.9.jar)
UCHIJAAAA aether{1.7.10-1.6} [Aether II] (aether-1.7.10-1.6.jar)
UCHIJAAAA BiblioCraft{1.11.4} [BiblioCraft] (BiblioCraft[v1.11.4][MC1.7.10].jar)
UCHIJAAAA etfuturum{1.5.5} [Et Futurum] (Et Futurum-1.5.5.jar)
UCHIJAAAA Baubles{1.0.1.10} [Baubles] (Baubles-1.7.10-1.0.1.10.jar)
UCHIJAAAA Thaumcraft{4.2.3.5} [Thaumcraft] (Thaumcraft-1.7.10-4.2.3.5.jar)
UCHIJAAAA yegamolchattels{1.1.2} [Ye Gamol Chattels] (YeGamolChattels-1.1.2.jar)
GL info: ' Vendor: 'ATI Technologies Inc.' Version: '4.5.13399 Compatibility Profile Context 15.200.1065.0' Renderer: 'TRINITY DEVASTATOR MOBILE'
Launched Version: 1.7.10-Forge10.13.4.1558-1.7.10
LWJGL: 2.9.1
OpenGL: TRINITY DEVASTATOR MOBILE GL version 4.5.13399 Compatibility Profile Context 15.200.1065.0, 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: []
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)