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My Minecraft Survival world was working perfectly fine with forge mods. Suddenly the world was entered in a 1.8.8 non-modded client and things disappeared. I tried to fix it by entering with the forge 1.7.10 client and gives me this error:

---- Minecraft Crash Report ----
// Oops.

Time: 6/20/16 9:38 PM
Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
at com.hackshop.ultimate_unicorn.mobs.MobEventHandler.onEntityJoinWorld(MobEventHandler.java:51)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_114_MobEventHandler_onEntityJoinWorld_EntityJoinWorldEvent.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140)
at net.minecraft.world.World.func_72868_a(World.java:3301)
at net.minecraft.world.chunk.Chunk.func_76631_c(Chunk.java:921)
at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:46)
at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:12)
at net.minecraftforge.common.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:344)
at net.minecraftforge.common.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:302)
at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:12)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:126)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:101)
at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:265)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:130)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:153)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

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

-- 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: 168614096 bytes (160 MB) / 447926272 bytes (427 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: 38, tcache: 12, allocated: 1, tallocated: 16
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1558 Optifine OptiFine_1.7.10_HD_U_D4 46 mods loaded, 46 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAA FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1558-1.7.10.jar)
UCHIJAA Forge{10.13.4.1558} [Minecraft Forge] (forge-1.7.10-10.13.4.1558-1.7.10.jar)
UCHIJAA CodeChickenCore{1.0.7.47} [CodeChicken Core] (minecraft.jar)
UCHIJAA NotEnoughItems{1.0.5.120} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.5.120-universal.jar)
UCHIJAA FastCraft{1.23} [FastCraft] (fastcraft-1.23.jar)
UCHIJAA oresheepmod{v3.1.0} [Ore Sheep] (1.7.10-OreSheepMod-v3.1.0.jar)
UCHIJAA movillages{1.4.1} [Mo' Villages] ([1.7.10]MoVillages-1.4.1.jar)
UCHIJAA ChickenShed{1.1.3} [Chicken Shed] ([1.7.2+] ChickenShed (v1.1.3).jar)
UCHIJAA Baubles{1.0.1.10} [Baubles] (Baubles-1.7.10-1.0.1.10.jar)
UCHIJAA adventurebackpack{1.7.10-0.8b} [Adventure Backpack] (adventurebackpack-1.7.10-0.8c.jar)
UCHIJAA animalbikes{1.7.10} [Animal Bikes] (AnimalBikes_1.7.10.jar)
UCHIJAA BaMsGRAVE{1.4.2_01} [BaM's Grave] (bamsgrave-1.7.2-1.4.2_01.jar)
UCHIJAA BiomesOPlenty{2.1.0} [Biomes O' Plenty] (BiomesOPlenty-1.7.10-2.1.0.1067-universal.jar)
UCHIJAA blockrevenge{1.0} [Revenge of the Blocks] (BlockRevenge-v1.0-1.7.10.jar)
UCHIJAA cfm{3.4.8} [§9MrCrayfish's Furniture Mod] (cfm-3.4.8-mc1.7.10.jar)
UCHIJAA climatecontrol{0.6.beta57} [Climate Control] (ClimateControl-0.6.beta59.jar)
UCHIJAA colorfularmor{1.7.10-2.7} [Colorful Armor] (colorfularmor-1.7.10-2.7.jar)
UCHIJAA MineTweaker3{3.0.9} [MineTweaker 3] (CraftTweaker-1.7.10-3.0.9.jar)
UCHIJAA EnderZoo{1.7.10-1.0.15.32} [Ender Zoo] (EnderZoo-1.7.10-1.0.15.32.jar)
UCHIJAA etfuturum{1.5.5} [Et Futurum] (Et Futurum-1.5.5.jar)
UCHIJAA golems{1.20} [Extra Golems] (Extra-Golems[1.7.10]-1.20.jar)
UCHIJAA ExtraUtilities{1.2.12} [Extra Utilities] (extrautilities-1.2.12.jar)
UCHIJAA fairylights{1.4.0} [Fairy Lights] (fairylights-1.4.0-1.7.10.jar)
UCHIJAA GardenContainers{1.7.10-1.7.0} [Garden Containers] (GardenStuff-1.7.10-1.7.0.jar)
UCHIJAA GardenCore{1.7.10-1.7.0} [Garden Core] (GardenStuff-1.7.10-1.7.0.jar)
UCHIJAA GardenStuff{1.7.10-1.7.0} [Garden Stuff] (GardenStuff-1.7.10-1.7.0.jar)
UCHIJAA GardenTrees{1.7.10-1.7.0} [Garden Trees] (GardenStuff-1.7.10-1.7.0.jar)
UCHIJAA inpure|core{1.7.10R1.0.0B9} [INpureCore] (INpureCore-[1.7.10]1.0.0B9-62.jar)
UCHIJAA InventoryPets{1.4.3} [Inventory Pets] (inventorypets-1.7.10-1.4.3-universal.jar)
UCHIJAA journeymap{4.0.5} [JourneyMap] (JourneyMap4.0.5_Unlimited_MC1.7.10.jar)
UCHIJAA LLadders{0.4.0} [Luppii's Ladders] (Ladders-0.4.0-MC1.7.10.jar)
UCHIJAA reaper_lantern{1.47} [Lantern mod] (Lantern1.47[1.7.10].jar)
UCHIJAA MagicYarn{1.1.5} [Magic Yarn] (MagicYarn-1.7.10.jar)
UCHIJAA malisiscore{1.7.10-0.14.3} [MalisisCore] (malisiscore-1.7.10-0.14.3.jar)
UCHIJAA malisisdoors{1.7.10-1.13.2} [Malisis' Doors] (malisisdoors-1.7.10-1.13.2.jar)
UCHIJAA Neat{GRADLE:VERSION-GRADLE:BUILD} [Neat] (Neat 1.0-1.jar)
UCHIJAA neiintegration{1.1.2} [NEI Integration] (NEIIntegration-MC1.7.10-1.1.2.jar)
UCHIJAA harvestcraft{1.7.10j} [Pam's HarvestCraft] (Pam's HarvestCraft 1.7.10Lb.jar)
UCHIJAA PigManure{1.0.1} [Pig Manure] (pig-manure-1.0.1.jar)
UCHIJAA primitivemobs{1.0} [Primitive Mobs] (primitivemobs-1.0c-1.7.10.jar)
UCHIJAA ResourceLoader{1.3} [Resource Loader] (ResourceLoader-MC1.7.10-1.3.jar)
UCHIJAA ropebridge{1.3} [Rope Bridge] (RopeBridge-v1.3-mc1.7.10.jar)
UCHIJAA stacywolves{1.0.7-1.7.10} [Stacy's Wolves Mod] (Stacy'sWolvesMod-1.7.10-1.0.7.jar)
UCHIJAA StorageDrawers{1.7.10-1.9.8} [Storage Drawers] (StorageDrawers-1.7.10-1.9.8.jar)
UCHIJAA ultimate_unicorn_mod{1.4.14} [Wings, Horns, and Hooves, the Ultimate Unicorn Mod!] (ultimate_unicorn_mod-1.7.10-1.4.14.jar)
GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'
OptiFine Version: OptiFine_1.7.10_HD_U_D4
Render Distance Chunks: 16
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
OpenGlVersion: 3.1.0 - Build 9.17.10.4229
OpenGlRenderer: Intel(R) HD Graphics 2000
OpenGlVendor: Intel
CpuCount: 4

Please help!!! :'(