Here is the crush report:

Description: Rendering overlay

org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:392) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:250) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
at org.spongepowered.asm.service.modlauncher.MixinTransformationHandler.processClass(MixinTransformationHandler.java:131) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
at org.spongepowered.asm.launch.MixinLaunchPluginLegacy.processClass(MixinLaunchPluginLegacy.java:131) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
at cpw.mods.modlauncher.serviceapi.ILaunchPluginService.processClassWithFlags(ILaunchPluginService.java:156) ~[modlauncher-10.0.9.jar:10.0.9+10.0.9+main.dcd20f30] {}
at cpw.mods.modlauncher.LaunchPluginHandler.offerClassNodeToPlugins(LaunchPluginHandler.java:88) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:120) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.TransformingClassLoader.maybeTransformClassBytes(TransformingClassLoader.java:50) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.cl.ModuleClassLoader.readerToClass(ModuleClassLoader.java:113) ~[securejarhandler-2.1.10.jar:?] {}
at cpw.mods.cl.ModuleClassLoader.lambda$findClass$15(ModuleClassLoader.java:219) ~[securejarhandler-2.1.10.jar:?] {}
at cpw.mods.cl.ModuleClassLoader.loadFromModule(ModuleClassLoader.java:229) ~[securejarhandler-2.1.10.jar:?] {}
at cpw.mods.cl.ModuleClassLoader.findClass(ModuleClassLoader.java:219) ~[securejarhandler-2.1.10.jar:?] {}
at cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:135) ~[securejarhandler-2.1.10.jar:?] {}
at java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[?:?] {}
at net.minecraft.client.renderer.entity.EntityRenderers.(EntityRenderers.java:31) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.client.renderer.entity.EntityRenderDispatcher.m_6213_(EntityRenderDispatcher.java:360) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.server.packs.resources.ResourceManagerReloadListener.m_10759_(ResourceManagerReloadListener.java:15) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading}
at java.util.concurrent.CompletableFuture$UniRun.tryFire(CompletableFuture.java:787) ~[?:?] {}
at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482) ~[?:?] {}
at net.minecraft.server.packs.resources.SimpleReloadInstance.m_143940_(SimpleReloadInstance.java:69) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading}
at net.minecraft.util.thread.BlockableEventLoop.m_6367_(BlockableEventLoop.java:156) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.util.thread.ReentrantBlockableEventLoop.m_6367_(ReentrantBlockableEventLoop.java:23) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading}
at net.minecraft.util.thread.BlockableEventLoop.m_7245_(BlockableEventLoop.java:130) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.util.thread.BlockableEventLoop.m_18699_(BlockableEventLoop.java:115) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.client.Minecraft.m_91383_(Minecraft.java:1106) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.m_91374_(Minecraft.java:718) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(Main.java:218) ~[Fabula.jar:?] {re:classloading,pl:runtimedistcleaner:A}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] {}
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {}
at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?] {}
at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.runTarget(CommonLaunchHandler.java:111) ~[fmlloader-1.20.1-47.2.0.jar:?] {}
at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.clientService(CommonLaunchHandler.java:99) ~[fmlloader-1.20.1-47.2.0.jar:?] {}
at net.minecraftforge.fml.loading.targets.CommonClientLaunchHandler.lambda$makeService$0(CommonClientLaunchHandler.java:25) ~[fmlloader-1.20.1-47.2.0.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:108) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:78) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) ~[bootstraplauncher-1.1.2.jar:?] {}
Caused by: org.spongepowered.asm.mixin.throwables.ClassMetadataNotFoundException: top.theillusivec4.curios.api.CuriosApi
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transformMethod(MixinPreProcessorStandard.java:754) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transform(MixinPreProcessorStandard.java:739) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.attach(MixinPreProcessorStandard.java:310) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.createContextFor(MixinPreProcessorStandard.java:280) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
at org.spongepowered.asm.mixin.transformer.MixinInfo.createContextFor(MixinInfo.java:1288) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:292) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
at org.spongepowered.asm.mixin.transformer.TargetClassContext.apply(TargetClassContext.java:383) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
at org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:365) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:363) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
... 41 more

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

-- Head --
Thread: Render thread
Stacktrace:
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:392) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:250) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
at org.spongepowered.asm.service.modlauncher.MixinTransformationHandler.processClass(MixinTransformationHandler.java:131) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
at org.spongepowered.asm.launch.MixinLaunchPluginLegacy.processClass(MixinLaunchPluginLegacy.java:131) ~[mixin-0.8.5.jar:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4] {}
at cpw.mods.modlauncher.serviceapi.ILaunchPluginService.processClassWithFlags(ILaunchPluginService.java:156) ~[modlauncher-10.0.9.jar:10.0.9+10.0.9+main.dcd20f30] {}
at cpw.mods.modlauncher.LaunchPluginHandler.offerClassNodeToPlugins(LaunchPluginHandler.java:88) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:120) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.TransformingClassLoader.maybeTransformClassBytes(TransformingClassLoader.java:50) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.cl.ModuleClassLoader.readerToClass(ModuleClassLoader.java:113) ~[securejarhandler-2.1.10.jar:?] {}
at cpw.mods.cl.ModuleClassLoader.lambda$findClass$15(ModuleClassLoader.java:219) ~[securejarhandler-2.1.10.jar:?] {}
at cpw.mods.cl.ModuleClassLoader.loadFromModule(ModuleClassLoader.java:229) ~[securejarhandler-2.1.10.jar:?] {}
at cpw.mods.cl.ModuleClassLoader.findClass(ModuleClassLoader.java:219) ~[securejarhandler-2.1.10.jar:?] {}
at cpw.mods.cl.ModuleClassLoader.loadClass(ModuleClassLoader.java:135) ~[securejarhandler-2.1.10.jar:?] {}
at java.lang.ClassLoader.loadClass(ClassLoader.java:525) ~[?:?] {}
at net.minecraft.client.renderer.entity.EntityRenderers.(EntityRenderers.java:31) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.client.renderer.entity.EntityRenderDispatcher.m_6213_(EntityRenderDispatcher.java:360) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.server.packs.resources.ResourceManagerReloadListener.m_10759_(ResourceManagerReloadListener.java:15) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading}
at java.util.concurrent.CompletableFuture$UniRun.tryFire(CompletableFuture.java:787) ~[?:?] {}
at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482) ~[?:?] {}
at net.minecraft.server.packs.resources.SimpleReloadInstance.m_143940_(SimpleReloadInstance.java:69) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading}
at net.minecraft.util.thread.BlockableEventLoop.m_6367_(BlockableEventLoop.java:156) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.util.thread.ReentrantBlockableEventLoop.m_6367_(ReentrantBlockableEventLoop.java:23) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading}
at net.minecraft.util.thread.BlockableEventLoop.m_7245_(BlockableEventLoop.java:130) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading,pl:accesstransformer:B}
-- Overlay render details --
Details:
Overlay name: net.minecraftforge.client.loading.ForgeLoadingOverlay
Stacktrace:
at net.minecraft.client.renderer.GameRenderer.m_109093_(GameRenderer.java:957) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.m_91383_(Minecraft.java:1146) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.m_91374_(Minecraft.java:718) ~[client-1.20.1-20230612.114412-srg.jar%23160!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(Main.java:218) ~[Fabula.jar:?] {re:classloading,pl:runtimedistcleaner:A}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] {}
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {}
at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?] {}
at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.runTarget(CommonLaunchHandler.java:111) ~[fmlloader-1.20.1-47.2.0.jar:?] {}
at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.clientService(CommonLaunchHandler.java:99) ~[fmlloader-1.20.1-47.2.0.jar:?] {}
at net.minecraftforge.fml.loading.targets.CommonClientLaunchHandler.lambda$makeService$0(CommonClientLaunchHandler.java:25) ~[fmlloader-1.20.1-47.2.0.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:108) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:78) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) ~[modlauncher-10.0.9.jar:?] {}
at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) ~[bootstraplauncher-1.1.2.jar:?] {}

-- Last reload --
Details:
Reload number: 1
Reload reason: initial
Finished: No
Packs: vanilla

-- System Details --
Details:
Minecraft Version: 1.20.1
Minecraft Version ID: 1.20.1
Operating System: Windows 10 (amd64) version 10.0
Java Version: 17.0.8, Microsoft
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft
Memory: 520557952 bytes (496 MiB) / 872415232 bytes (832 MiB) up to 13757317120 bytes (13120 MiB)
CPUs: 16
Processor Vendor: AuthenticAMD
Processor Name: AMD Ryzen 7 5800 8-Core Processor
Identifier: AuthenticAMD Family 25 Model 33 Stepping 2
Microarchitecture: Zen 3
Frequency (GHz): 3.39
Number of physical packages: 1
Number of physical CPUs: 8
Number of logical CPUs: 16
Graphics card #0 name: NVIDIA GeForce RTX 3060
Graphics card #0 vendor: NVIDIA (0x10de)
Graphics card #0 VRAM (MB): 4095.00
Graphics card #0 deviceId: 0x2504
Graphics card #0 versionInfo: DriverVersion=32.0.15.5585
Memory slot #0 capacity (MB): 8192.00
Memory slot #0 clockSpeed (GHz): 3.20
Memory slot #0 type: DDR4
Memory slot #1 capacity (MB): 8192.00
Memory slot #1 clockSpeed (GHz): 3.20
Memory slot #1 type: DDR4
Virtual memory max (MB): 26999.60
Virtual memory used (MB): 18486.96
Swap memory total (MB): 10752.00
Swap memory used (MB): 660.04
JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx13100M -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
Launched Version: Fabula
Backend library: LWJGL version 3.3.1 build 7
Backend API: NVIDIA GeForce RTX 3060/PCIe/SSE2 GL version 4.6.0 NVIDIA 555.85, NVIDIA Corporation
Window size: 1920x1080
GL Caps: Using framebuffer using OpenGL 3.2
GL debug messages:
Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'forge'
Type: Client (map_client.txt)
Graphics mode: fast
Resource Packs:
Current Language: ru
CPU: 16x AMD Ryzen 7 5800 8-Core Processor
ModLauncher: 10.0.9+10.0.9+main.dcd20f30
ModLauncher launch target: forgeclient
ModLauncher naming: srg
ModLauncher services:
mixin-0.8.5.jar mixin PLUGINSERVICE
eventbus-6.0.5.jar eventbus PLUGINSERVICE
fmlloader-1.20.1-47.2.0.jar slf4jfixer PLUGINSERVICE
fmlloader-1.20.1-47.2.0.jar object_holder_definalize PLUGINSERVICE
fmlloader-1.20.1-47.2.0.jar runtime_enum_extender PLUGINSERVICE
fmlloader-1.20.1-47.2.0.jar capability_token_subclass PLUGINSERVICE
accesstransformers-8.0.4.jar accesstransformer PLUGINSERVICE
fmlloader-1.20.1-47.2.0.jar runtimedistcleaner PLUGINSERVICE
modlauncher-10.0.9.jar mixin TRANSFORMATIONSERVICE
modlauncher-10.0.9.jar fml TRANSFORMATIONSERVICE
FML Language Providers:
[email protected]
lowcodefml@null
javafml@null
Mod List:
client-1.20.1-20230612.114412-srg.jar |Minecraft |minecraft |1.20.1 |NONE |Manifest: a1:d4:5e:04:4f:d3:d6:e0:7b:37:97:cf:77:b0:de:ad:4a:47:ce:8c:96:49:5f:0a:cf:8c:ae:b2:6d:4b:8a:3f
forge-1.20.1-47.2.0-universal.jar |Forge |forge |47.2.0 |NONE |Manifest: 84:ce:76:e8:45:35:e4:0e:63:86:df:47:59:80:0f:67:6c:c1:5f:6e:5f:4d:b3:54:47:1a:9f:7f:ed:5e:f2:90

I have no idea what can cause this problem, I have curios installed

I don't know if you're using some strange launcher setup that strips out information like the modlist from crash reports, or modified the report yourself, but I don't see anything related to SimpleHats in that report.

Try making sure both SimpleHats and Curios are updated to their latest 1.20.1 versions, and if it crashes again upload the full crash report and the latest.log file from the logs folder.

Closed as no response.