Game crash whilst java.lang.NoSuchMethodError: net.minecraft.client.multiplayer.WorldClient.isPlayerUpdate()Z

Whenever I join WynnCraft I get this message and my game crashes, any idea what to do? I am on mac btw if that changes anything.

---- Minecraft Crash Report ----

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

// There are four lights!

Time: 1/24/21 1:33 PM
Description: Unexpected error

java.lang.NoSuchMethodError: net.minecraft.client.multiplayer.WorldClient.isPlayerUpdate()Z
    at net.minecraft.client.renderer.chunk.RenderChunk.isWorldPlayerUpdate(RenderChunk.java:570)
    at net.minecraft.client.renderer.chunk.RenderChunk.func_178575_a(RenderChunk.java:532)
    at net.minecraft.client.renderer.chunk.ChunkCompileTaskGenerator.func_178542_e(SourceFile:64)
    at net.minecraft.client.renderer.chunk.RenderChunk.func_178578_b(RenderChunk.java:361)
    at net.minecraft.client.renderer.chunk.RenderChunk.func_178585_h(RenderChunk.java:499)
    at net.minecraft.client.renderer.chunk.RenderChunk.func_189562_a(RenderChunk.java:129)
    at net.minecraft.client.renderer.ViewFrustum.func_178163_a(ViewFrustum.java:81)
    at net.minecraft.client.renderer.RenderGlobal.func_174970_a(RenderGlobal.java:1165)
    at net.minecraft.client.renderer.EntityRenderer.func_175068_a(EntityRenderer.java:1700)
    at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1590)
    at net.minecraft.client.renderer.EntityRenderer.func_181560_a(EntityRenderer.java:1361)
    at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1119)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:398)
    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:498)
    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.client.renderer.chunk.RenderChunk.isWorldPlayerUpdate(RenderChunk.java:570)
    at net.minecraft.client.renderer.chunk.RenderChunk.func_178575_a(RenderChunk.java:532)
    at net.minecraft.client.renderer.chunk.ChunkCompileTaskGenerator.func_178542_e(SourceFile:64)
    at net.minecraft.client.renderer.chunk.RenderChunk.func_178578_b(RenderChunk.java:361)
    at net.minecraft.client.renderer.chunk.RenderChunk.func_178585_h(RenderChunk.java:499)
    at net.minecraft.client.renderer.chunk.RenderChunk.func_189562_a(RenderChunk.java:129)
    at net.minecraft.client.renderer.ViewFrustum.func_178163_a(ViewFrustum.java:81)
    at net.minecraft.client.renderer.RenderGlobal.func_174970_a(RenderGlobal.java:1165)
    at net.minecraft.client.renderer.EntityRenderer.func_175068_a(EntityRenderer.java:1700)
    at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1590)

-- Affected level --
Details:
    Level name: MpServer
    All players: 1 total; [EntityPlayerSP['DAREALMoneyMan'/11527, l='MpServer', x=-1337.50, y=16.20, z=-1120.50]]
    Chunk stats: MultiplayerChunkCache: 0, 0
    Level seed: 0
    Level generator: ID 01 - flat, ver 0. Features enabled: false
    Level generator options: 
    Level spawn location: World: (-1572,41,-1668), Chunk: (at 12,2,12 in -99,-105; contains blocks -1584,0,-1680 to -1569,255,-1665), Region: (-4,-4; contains chunks -128,-128 to -97,-97, blocks -2048,0,-2048 to -1537,255,-1537)
    Level time: 4428128415 game time, 146692669 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: adventure (ID 2). Hardcore: false. Cheats: false
    Forced entities: 1 total; [EntityPlayerSP['DAREALMoneyMan'/11527, l='MpServer', x=-1337.50, y=16.20, z=-1120.50]]
    Retry entities: 0 total; []
    Server brand: Wynncraft <- Spigot
    Server type: Non-integrated multiplayer server
Stacktrace:
    at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:420)
    at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2741)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:427)
    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:498)
    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: Mac OS X (x86_64) version 10.14.6
    Java Version: 1.8.0_74, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 1412569904 bytes (1347 MB) / 1946157056 bytes (1856 MB) up to 2147483648 bytes (2048 MB)
    JVM Flags: 7 total; -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: MCP 9.42 Powered by Forge 14.23.5.2854 Optifine OptiFine_1.12.1_HD_U_C5 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                                |
    |:------ |:--------- |:------------ |:----------------------------------- |:---------------------------------------- |
    | LCHIJA | minecraft | 1.12.2       | minecraft.jar                       | None                                     |
    | LCHIJA | mcp       | 9.42         | minecraft.jar                       | None                                     |
    | LCHIJA | FML       | 8.0.99.99    | forge-1.12.2-14.23.5.2854.jar       | e3c3d50c7c986df74c645c0ac54639741c90a557 |
    | LCHIJA | forge     | 14.23.5.2854 | forge-1.12.2-14.23.5.2854.jar       | e3c3d50c7c986df74c645c0ac54639741c90a557 |
    | LCHIJA | wynntils  | 1.9.0        | Wynntils-1.8.0_643-MC1.12.2 (1).jar | None                                     |

    Loaded coremods (and transformers): 
    GL info: ' Vendor: 'Intel Inc.' Version: '2.1 INTEL-12.10.19' Renderer: 'Intel HD Graphics 5000 OpenGL Engine'
    Wynntils Details: Running Wynntils v1.9.0 in STABLE, at a normal env
    Launched Version: 1.12.2-forge-14.23.5.2854
    LWJGL: 2.9.2
    OpenGL: Intel HD Graphics 5000 OpenGL Engine GL version 2.1 INTEL-12.10.19, Intel Inc.
    GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object 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: vanilla
    Current Language: English (US)
    Profiler Position: N/A (disabled)
    CPU: 4x Intel(R) Core(TM) i5-4250U CPU @ 1.30GHz