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Here's the error report...

The game crashed whilst exception in server tick loop
The game crashed whilst exception in server tick loop
Error: java.lang.IllegalArgumentException: ChunkNibbleArrays should be 2048 bytes not: 0

Here's the crash report ...

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 12/16/18 7:32 PM
Description: Exception in server tick loop

java.lang.IllegalArgumentException: ChunkNibbleArrays should be 2048 bytes not: 0
at net.minecraft.world.chunk.NibbleArray.<init>(SourceFile:16)
at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75823_a(AnvilChunkLoader.java:449)
at net.minecraft.world.chunk.storage.AnvilChunkLoader.checkedReadChunkFromNBT__Async(AnvilChunkLoader.java:128)
at net.minecraft.world.chunk.storage.AnvilChunkLoader.loadChunk__Async(AnvilChunkLoader.java:92)
at net.minecraftforge.common.chunkio.ChunkIOProvider.run(ChunkIOProvider.java:70)
at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:92)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:118)
at net.minecraft.world.gen.ChunkProviderServer.func_186028_c(ChunkProviderServer.java:89)
at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:135)
at net.minecraft.world.World.func_72964_e(World.java:310)
at net.minecraft.world.World.func_175726_f(World.java:305)
at net.minecraft.world.World.func_175625_s(World.java:2399)
at me.ichun.mods.sync.common.core.ChunkLoadHandler.ticketsLoaded(ChunkLoadHandler.java:32)
at net.minecraftforge.common.ForgeChunkManager.loadWorld(ForgeChunkManager.java:592)
at net.minecraftforge.common.ForgeInternalHandler.onDimensionLoad(ForgeInternalHandler.java:70)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_9_ForgeInternalHandler_onDimensionLoad_Load.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:132)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:156)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486)
at java.lang.Thread.run(Thread.java:745)

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

-- System Details --
Details:
Minecraft Version: 1.12.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 340355376 bytes (324 MB) / 603979776 bytes (576 MB) up to 2147483648 bytes (2048 MB)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
IntCache: cache: 1, tcache: 1, allocated: 12, tallocated: 94
FML: MCP 9.42 Powered by Forge 14.23.5.2768 7 mods loaded, 7 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

| State | ID | Version | Source | Signature |
|:------------ |:--------- |:------------ |:----------------------------- |:---------------------------------------- |
| UCHIJAAAAAAA | minecraft | 1.12.2 | minecraft.jar | None |
| UCHIJAAAAAAA | mcp | 9.42 | minecraft.jar | None |
| UCHIJAAAAAAA | FML | 8.0.99.99 | forge-1.12.2-14.23.5.2768.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| UCHIJAAAAAAA | forge | 14.23.5.2768 | forge-1.12.2-14.23.5.2768.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| UCHIJAAAAAAA | chickens | 6.0.4 | chickens-6.0.4.jar | None |
| UCHIJAAAAAAA | ichunutil | 7.1.4 | iChunUtil-1.12.2-7.1.4.jar | None |
| UCHIJAAAAAAA | sync | 7.0.2 | Sync-1.12.2-7.0.2.jar | None |

Loaded coremods (and transformers):
GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
Profiler Position: N/A (disabled)
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

Please help me I really want to play on my world again

the world is corrupt - you'll need to fix the world somehow using an external tool, though I highly doubt it's possible.
alternatively: are you trying to load a 1.13 world? those can't be loaded in older versions of Minecraft due to the region format changing.

Looks like that world was loaded or created in 1.13.

As always, downgrading is not, was never and will never be officially supported. Please do not run 1.13 worlds in older versions of Minecraft.

Sooooo essentially I won't be able to load the world again?

if you used it in 1.13, you cannot use it in any earlier version, period.

Alright. Thanks