Crashing on start

[ForkyForkey]

Operating System

No response

Description of bug

Hello , I am pretty new to UltimMC. So I started to a 1.12.2 world an this happened when I started a creative world

Steps to reproduce

---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 9/28/23 10:15 PM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at amu.a(SourceFile:1173)
at buq.h(SourceFile:1614)
at buq.a(SourceFile:1203)
at buq.b(SourceFile:1188)
at buq.a(SourceFile:1033)
at bib.az(SourceFile:1023)
at bib.a(SourceFile:419)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:243)
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:278)
at org.multimc.EntryPoint.listen(EntryPoint.java:143)
at org.multimc.EntryPoint.main(EntryPoint.java:34)

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

-- Head --
Thread: Client thread
Stacktrace:
at amu.a(SourceFile:1173)
at buq.h(SourceFile:1614)
at buq.a(SourceFile:1203)
at buq.b(SourceFile:1188)

-- 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 bsb.a(SourceFile:366)
at bib.b(SourceFile:2587)
at bib.a(SourceFile:433)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:243)
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:278)
at org.multimc.EntryPoint.listen(EntryPoint.java:143)
at org.multimc.EntryPoint.main(EntryPoint.java:34)

-- System Details --
Details:
Minecraft Version: 1.12.2
Operating System: Windows 11 (x86) version 10.0
Java Version: 1.8.0_381, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 328118144 bytes (312 MB) / 506986496 bytes (483 MB) up to 1354235904 bytes (1291 MB)
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xms500m -Xmx1336m
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 1.12.2
LWJGL: 2.9.4
OpenGL: AMD Radeon(TM) Graphics GL version 4.6.0 Compatibility Profile Context 22.20.42.02.221103, 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: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: 
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 8x AMD Ryzen 5 7520U with Radeon Graphics 

Suspected cause

I dont know sorry

This issue is unique

• I have searched the issue tracker and did not find an issue describing my bug.