I've been away from minecraft for a bit, but was excited today to start playing again and to see there was an OptiFabric update out. However, when I have OptiFabric in my minecraft mods folder, the game no longer starts. I will confess I play with a short list of mods, so my instinct was that there was a conflict, but after taking everything else out, the game still wouldn't start (and, inversely, when I took out only OptiFabric, the game would start no matter the other mods). I am on a Mac if that helps? One way or the other, I would love to see this resolved soon!

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

Time: 2023-08-25 02:05:07
Description: Initializing game

java.lang.RuntimeException: Mixin transformation of net.minecraft.class_756 failed
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:427)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218)
at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
at net.minecraft.class_310.(class_310.java:564)
at net.minecraft.client.main.Main.main(Main.java:211)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:468)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
Caused by: org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:392)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:234)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:202)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:422)
... 9 more
Caused by: org.spongepowered.asm.mixin.injection.throwables.InjectionError: Critical injection failure: Argument modifier method showmeyourskin$modifyGlint1(Z)Z in showmeyourskin.mixins.json:BuiltinModelItemRendererMixin from mod showmeyourskin failed injection check, (0/1) succeeded. Scanned 1 target(s). Using refmap show-me-your-skin-refmap.json
at org.spongepowered.asm.mixin.injection.struct.InjectionInfo.postInject(InjectionInfo.java:468)
at org.spongepowered.asm.mixin.transformer.MixinTargetContext.applyInjections(MixinTargetContext.java:1384)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyInjections(MixinApplicatorStandard.java:1062)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyMixin(MixinApplicatorStandard.java:402)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:327)
at org.spongepowered.asm.mixin.transformer.TargetClassContext.apply(TargetClassContext.java:421)
at org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:403)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:363)
... 12 more

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

-- Head --
Thread: Render thread
Stacktrace:
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:427)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218)
at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
at net.minecraft.class_310.(class_310.java:564)

-- Initialization --
Details:
Modules:
Stacktrace:
at net.minecraft.client.main.Main.main(Main.java:211)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:468)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)

-- System Details --
Details:
Minecraft Version: 1.20.1
Minecraft Version ID: 1.20.1
Operating System: Mac OS X (aarch64) version 13.2.1
Java Version: 17.0.3, Microsoft
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft
Memory: 347219712 bytes (331 MiB) / 570425344 bytes (544 MiB) up to 2147483648 bytes (2048 MiB)
CPUs: 8
Processor Vendor: Apple Inc.
Processor Name: Apple M1
Identifier: Apple Inc. Family 0x1b588bb3 Model 0 Stepping 0
Microarchitecture: ARM64 SoC: Firestorm + Icestorm
Frequency (GHz): 3.20
Number of physical packages: 1
Number of physical CPUs: 8
Number of logical CPUs: 8
Graphics card #0 name: Apple M1
Graphics card #0 vendor: Apple (0x106b)
Graphics card #0 VRAM (MB): 0.00
Graphics card #0 deviceId: unknown
Graphics card #0 versionInfo: unknown
Memory slot #0 capacity (MB): 0.00
Memory slot #0 clockSpeed (GHz): 0.00
Memory slot #0 type: unknown
Virtual memory max (MB): 16384.00
Virtual memory used (MB): 9457.17
Swap memory total (MB): 0.00
Swap memory used (MB): 0.00
JVM Flags: 7 total; -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
Fabric Mods:
ambientsounds: Ambient Sounds (Fabric) 5.2.19
betterf3: BetterF3 7.0.0
cloth-config: Cloth Config v11 11.0.99
cloth-basic-math: cloth-basic-math 0.6.1
collective: Collective 6.61
creativecore: CreativeCore (Fabric) 2.10.23
net_minecraftforge_eventbus: eventbus 6.0.3
fabric-api: Fabric API 0.83.1+1.20.1
fabric-api-lookup-api-v1: Fabric API Lookup API (v1) 1.6.34+4d8536c977
fabric-biome-api-v1: Fabric Biome API (v1) 13.0.10+b3afc78b77
fabric-block-api-v1: Fabric Block API (v1) 1.0.9+e022e5d177
fabric-blockrenderlayer-v1: Fabric BlockRenderLayer Registration (v1) 1.1.39+b3afc78b77
fabric-client-tags-api-v1: Fabric Client Tags 1.0.20+b3afc78b77
fabric-command-api-v1: Fabric Command API (v1) 1.2.32+f71b366f77
fabric-command-api-v2: Fabric Command API (v2) 2.2.11+b3afc78b77
fabric-commands-v0: Fabric Commands (v0) 0.2.49+df3654b377
fabric-containers-v0: Fabric Containers (v0) 0.1.61+df3654b377
fabric-content-registries-v0: Fabric Content Registries (v0) 4.0.7+b3afc78b77
fabric-convention-tags-v1: Fabric Convention Tags 1.5.3+b3afc78b77
fabric-crash-report-info-v1: Fabric Crash Report Info (v1) 0.2.18+aeb40ebe77
fabric-data-generation-api-v1: Fabric Data Generation API (v1) 12.1.11+b3afc78b77
fabric-dimensions-v1: Fabric Dimensions API (v1) 2.1.51+b3afc78b77
fabric-entity-events-v1: Fabric Entity Events (v1) 1.5.21+b3afc78b77
fabric-events-interaction-v0: Fabric Events Interaction (v0) 0.6.0+b3afc78b77
fabric-events-lifecycle-v0: Fabric Events Lifecycle (v0) 0.2.61+df3654b377
fabric-game-rule-api-v1: Fabric Game Rule API (v1) 1.0.38+b04edc7a77
fabric-item-api-v1: Fabric Item API (v1) 2.1.26+b3afc78b77
fabric-item-group-api-v1: Fabric Item Group API (v1) 4.0.7+b3afc78b77
fabric-keybindings-v0: Fabric Key Bindings (v0) 0.2.34+df3654b377
fabric-loot-api-v2: Fabric Loot API (v2) 1.1.37+b3afc78b77
fabric-loot-tables-v1: Fabric Loot Tables (v1) 1.1.41+9e7660c677
fabric-message-api-v1: Fabric Message API (v1) 5.1.6+b3afc78b77
fabric-mining-level-api-v1: Fabric Mining Level API (v1) 2.1.47+b3afc78b77
fabric-models-v0: Fabric Models (v0) 0.3.35+b3afc78b77
fabric-networking-api-v1: Fabric Networking API (v1) 1.3.8+b3afc78b77
fabric-networking-v0: Fabric Networking (v0) 0.3.48+df3654b377
fabric-object-builder-api-v1: Fabric Object Builder API (v1) 11.0.6+b3afc78b77
fabric-particles-v1: Fabric Particles (v1) 1.0.28+b3afc78b77
fabric-recipe-api-v1: Fabric Recipe API (v1) 1.0.18+b3afc78b77
fabric-registry-sync-v0: Fabric Registry Sync (v0) 2.2.6+b3afc78b77
fabric-renderer-api-v1: Fabric Renderer API (v1) 3.0.1+b3afc78b77
fabric-renderer-indigo: Fabric Renderer - Indigo 1.3.1+b3afc78b77
fabric-renderer-registries-v1: Fabric Renderer Registries (v1) 3.2.44+df3654b377
fabric-rendering-data-attachment-v1: Fabric Rendering Data Attachment (v1) 0.3.33+b3afc78b77
fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 3.0.26+b3afc78b77
fabric-rendering-v0: Fabric Rendering (v0) 1.1.47+df3654b377
fabric-rendering-v1: Fabric Rendering (v1) 3.0.6+b3afc78b77
fabric-resource-conditions-api-v1: Fabric Resource Conditions API (v1) 2.3.5+ea08f9d877
fabric-screen-handler-api-v1: Fabric Screen Handler API (v1) 1.3.27+b3afc78b77
fabric-sound-api-v1: Fabric Sound API (v1) 1.0.12+b3afc78b77
fabric-transfer-api-v1: Fabric Transfer API (v1) 3.2.2+b3afc78b77
fabric-transitive-access-wideners-v1: Fabric Transitive Access Wideners (v1) 4.2.0+b3afc78b77
fabricloader: Fabric Loader 0.14.21
fpsreducer: FPS Reducer 1.20-2.5
guicompass: GUI Compass 4.2
java: OpenJDK 64-Bit Server VM 17
jei: Just Enough Items 15.1.0.19
minecraft: Minecraft 1.20.1
modmenu: Mod Menu 7.1.0
fabric-api-base: Fabric API Base 0.4.29+b04edc7a77
fabric-key-binding-api-v1: Fabric Key Binding API (v1) 1.0.36+fb8d95da77
fabric-lifecycle-events-v1: Fabric Lifecycle Events (v1) 2.2.20+b3afc78b77
fabric-resource-loader-v0: Fabric Resource Loader (v0) 0.11.7+f7923f6d77
fabric-screen-api-v1: Fabric Screen API (v1) 2.0.6+b3afc78b77
mousetweaks: Mouse Tweaks 2.25
optifabric: OptiFabric 1.13.25
mm: Manningham Mills 2.3
showmeyourskin: Show Me Your Skin! 1.6.5+1.20
cardinal-components-base: Cardinal Components API (base) 5.2.1
cardinal-components-entity: Cardinal Components API (entities) 5.2.1
cicada: CICADA 0.4.0
com_github_llamalad7_mixinextras: MixinExtras 0.2.0-beta.6
skinlayers: 3d Skin Layers 1.5.3-mc1.20
worldedit: WorldEdit 7.2.15+6463-5ca4dff
Launched Version: fabric-loader-0.14.21-1.20.1
Backend library: LWJGL version 3.3.1 SNAPSHOT
Backend API: Apple M1 GL version 4.1 Metal - 83, Apple
Window size:
GL Caps: Using framebuffer using OpenGL 3.2
GL debug messages:
Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'optifine'
Type: Client (map_client.txt)
CPU: 8x Apple M1
OptiFine Version: OptiFine_1.20.1_HD_U_I5
OptiFine Build: 20230707-211226
Render Distance Chunks: 30
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: Tea_V1.5.6.1.zip
OpenGlVersion: 4.1 Metal - 83
OpenGlRenderer: Apple M1
OpenGlVendor: Apple
CpuCount: 8

-- OptiFabric --
Details:
OptiFine jar designed for: 1.20.1
OptiFine jar version: OptiFine_1.20.1_HD_U_I5
OptiFine jar status: Valid OptiFine installer
OptiFine remapped jar: /Users/usernamehere/Library/Application Support/minecraft/.optifine/OptiFine_1.20.1_HD_U_I5/Optifine-mapped.jar
OptiFabric error:

Use fabric api version 0.85.0. For some reason, optifabric cannot start with a newer version

Remove ShowMeYourSkin, its broken with Optifine / Optifabric.