it looks like you are using an unsupported modified version of the game. The game crashed whilst exception in server tick loop.

[Ochabro]

This is my first time using forge/downloading mods for Minecraft. For some reason it goes well until select a world to play in, it loads for like three seconds before crashing. Iv'e tried everything I could think of, but I can't get it to work. I'm using the same versions for the mod and forge (1.12.2), and I should have plenty of space on my computer. I tried downloading two different mods with forge and they both crashed. This is the crash report for the second mod I downloaded (I think it's the crash report). 

 

---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 4/5/19 3:32 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.server.MinecraftServer.func_71222_d(MinecraftServer.java:344)
    at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:142)
    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 7 (x86) version 6.1
    Java Version: 1.8.0_51, Oracle Corporation
    Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
    Memory: 329399432 bytes (314 MB) / 603979776 bytes (576 MB) up to 1073741824 bytes (1024 MB)
    JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: MCP 9.42 Powered by Forge 14.23.5.2768 5 mods loaded, 5 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                                |
    |:------- |:------------- |:------------ |:--------------------------------------------- |:---------------------------------------- |
    | UCHIJAA | minecraft     | 1.12.2       | minecraft.jar                                 | None                                     |
    | UCHIJAA | mcp           | 9.42         | minecraft.jar                                 | None                                     |
    | UCHIJAA | FML           | 8.0.99.99    | forge-1.12.2-14.23.5.2768.jar                 | e3c3d50c7c986df74c645c0ac54639741c90a557 |
    | UCHIJAA | forge         | 14.23.5.2768 | forge-1.12.2-14.23.5.2768.jar                 | e3c3d50c7c986df74c645c0ac54639741c90a557 |
    | UCHIJAA | biomesoplenty | 7.0.1.2361   | BiomesOPlenty-1.12.2-7.0.1.2361-universal.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'

 

Any help would be very much appreciated!! (*´ω` *)

Edited April 5, 2019 by Ochabro

[DaemonUmbra]

Looks like your world's corrupted.

[Ochabro]

What do I do to fix it? Just try creating a new world?

[DaemonUmbra]

Creating a new world and deleting the old one is all you can do.

[Ochabro]

OMg thank you. Literally three days of trying to figure this crap out and all I had to do was made a new world I can't oof. thank you so much (*T- T* )

[Ochabro]

Okay so now that I've gotten one mod to work, I add another and the game crashes again here's the crash report

 

---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 4/12/19 9:00 PM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
    at net.minecraft.world.World.getSkyColorBody(World.java:1484)
    at net.minecraft.world.WorldProvider.getSkyColor(WorldProvider.java:463)
    at net.minecraft.world.World.func_72833_a(World.java:1475)
    at net.minecraft.client.renderer.EntityRenderer.func_78466_h(EntityRenderer.java:1723)
    at net.minecraft.client.renderer.EntityRenderer.func_175068_a(EntityRenderer.java:1273)
    at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1259)
    at net.minecraft.client.renderer.EntityRenderer.func_181560_a(EntityRenderer.java:1062)
    at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1118)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:397)
    at net.minecraft.client.main.Main.main(SourceFile:123)
    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:497)
    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 --
Thread: Client thread
Stacktrace:
    at net.minecraft.world.World.getSkyColorBody(World.java:1484)
    at net.minecraft.world.WorldProvider.getSkyColor(WorldProvider.java:463)
    at net.minecraft.world.World.func_72833_a(World.java:1475)
    at net.minecraft.client.renderer.EntityRenderer.func_78466_h(EntityRenderer.java:1723)
    at net.minecraft.client.renderer.EntityRenderer.func_175068_a(EntityRenderer.java:1273)
    at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1259)

-- Affected level --
Details:
    Level name: MpServer
    All players: 0 total; []
    Chunk stats: MultiplayerChunkCache: 0, 0
    Level seed: 0
    Level generator: ID 00 - default, ver 1. Features enabled: false
    Level generator options: 
    Level spawn location: World: (8,64,8), Chunk: (at 8,4,8 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: 0 game time, 0 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: creative (ID 1). Hardcore: false. Cheats: false
    Forced entities: 0 total; []
    Retry entities: 0 total; []
    Server brand: ~~ERROR~~ NullPointerException: null
    Server type: Integrated singleplayer server
Stacktrace:
    at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:420)
    at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2740)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:426)
    at net.minecraft.client.main.Main.main(SourceFile:123)
    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:497)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
    Minecraft Version: 1.12.2
    Operating System: Windows 7 (x86) version 6.1
    Java Version: 1.8.0_51, Oracle Corporation
    Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
    Memory: 319064864 bytes (304 MB) / 855638016 bytes (816 MB) up to 1073741824 bytes (1024 MB)
    JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M
    IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
    FML: MCP 9.42 Powered by Forge 14.23.5.2768 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

    | State     | ID            | Version      | Source                                        | Signature                                |
    |:--------- |:------------- |:------------ |:--------------------------------------------- |:---------------------------------------- |
    | UCHIJAAAA | minecraft     | 1.12.2       | minecraft.jar                                 | None                                     |
    | UCHIJAAAA | mcp           | 9.42         | minecraft.jar                                 | None                                     |
    | UCHIJAAAA | FML           | 8.0.99.99    | forge-1.12.2-14.23.5.2768.jar                 | e3c3d50c7c986df74c645c0ac54639741c90a557 |
    | UCHIJAAAA | forge         | 14.23.5.2768 | forge-1.12.2-14.23.5.2768.jar                 | e3c3d50c7c986df74c645c0ac54639741c90a557 |
    | UCHIJAAAA | biomesoplenty | 7.0.1.2361   | BiomesOPlenty-1.12.2-7.0.1.2361-universal.jar | None                                     |
    | UCHIJAAAA | cfm           | 6.2.0        | cfm-6.2.0-mc1.12.2.jar                        | None                                     |

    Loaded coremods (and transformers): 
    GL info: ' Vendor: 'ATI Technologies Inc.' Version: '4.1.11079 Compatibility Profile Context' Renderer: 'AMD Radeon HD 6530D Graphics '
    Launched Version: 1.12.2-forge1.12.2-14.23.5.2768
    LWJGL: 2.9.4
    OpenGL: AMD Radeon HD 6530D Graphics  GL version 4.1.11079 Compatibility Profile Context, ATI Technologies Inc.
    GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

    Using VBOs: Yes
    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)
    CPU: 4x AMD A6-3620 APU with Radeon(tm) HD Graphics

 

any help is appreciated, I just wanna play some minecraft 

[DaemonUmbra]

Try updating your mods to the most recent versions.

[Ochabro]

it didn't work, anything else I can try?