Please help

[UnknownSource12]

The game crashed whilst unexpected error
Error: java.lang.NullPointerException: Unexpected error

 

HOW DO I FIX THIS???

I was playing a pixelmon server but then I backed out then when i tried joining again that poppoed up I tried fixing it but it doesnt work. please help. Full crash report below 

 

 

---- Minecraft Crash Report ----

WARNING: coremods are present:
Contact their authors BEFORE contacting forge

// Don't be sad, have a hug! ❤️

Time: 6/7/19 2:32 AM
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:2285)
    at net.minecraft.client.renderer.EntityRenderer.func_175068_a(EntityRenderer.java:1638)
    at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1613)
    at net.minecraft.client.renderer.EntityRenderer.func_181560_a(EntityRenderer.java:1384)
    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:2285)
    at net.minecraft.client.renderer.EntityRenderer.func_175068_a(EntityRenderer.java:1638)
    at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1613)

-- 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: 688345678 game time, 1136 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:532)
    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 10 (x86) version 10.0
    Java Version: 1.8.0_51, Oracle Corporation
    Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
    Memory: 390042392 bytes (371 MB) / 805306368 bytes (768 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: 8, allocated: 20, tallocated: 86
    FML: MCP 9.42 Powered by Forge 14.23.5.2768 Optifine OptiFine_1.12.2_HD_U_E3 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                                |
    |:--------- |:--------- |:------------ |:--------------------------------------- |:---------------------------------------- |
    | 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 | pixelmon  | 7.0.5        | Pixelmon-1.12.2-7.0.5-universal (1).jar | None                                     |

    Loaded coremods (and transformers): 
    GL info: ' Vendor: 'ATI Technologies Inc.' Version: '4.5.13399 Compatibility Profile Context 15.201.1151.1008' Renderer: 'AMD Radeon HD 5700 Series'
    Launched Version: 1.12.2-forge1.12.2-14.23.5.2768
    LWJGL: 2.9.4
    OpenGL: AMD Radeon HD 5700 Series GL version 4.5.13399 Compatibility Profile Context 15.201.1151.1008, 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: ! ! ! Nestor - Faithful Edit (1).zip
    Current Language: English (US)
    Profiler Position: N/A (disabled)
    CPU: 8x Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz
    OptiFine Version: OptiFine_1.12.2_HD_U_E3
    OptiFine Build: 20181210-121000
    Render Distance Chunks: 6
    Mipmaps: 1
    Anisotropic Filtering: 1
    Antialiasing: 0
    Multitexture: false
    Shaders: null
    OpenGlVersion: 4.5.13399 Compatibility Profile Context 15.201.1151.1008
    OpenGlRenderer: AMD Radeon HD 5700 Series
    OpenGlVendor: ATI Technologies Inc.
    CpuCount: 8

[DaemonUmbra]

Try removing or updating Optifine