Description
Game does not finish launching due to mixins

Crashlog
Description: Mod loading error has occurred

java.lang.Exception: Mod Loading has failed
at net.minecraftforge.fml.CrashReportExtender.dumpModLoadingCrashReport(CrashReportExtender.java:85) ~[forge:?] {re:classloading}
at net.minecraftforge.fml.client.ClientModLoader.completeModLoading(ClientModLoader.java:188) ~[forge:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.lambda$null$1(Minecraft.java:508) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:itlt:CustomWindowTitle,xf:fml:randompatches:RandomPatches Minecraft Transformer,pl:mixin:APP:shutupexperimentalsettings.mixins.json:client.MixinMinecraft,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMinecraft,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.util.Util.func_215077_a(Util.java:418) ~[?:?] {re:classloading,xf:OptiFine:default,xf:fml:jmt_mcmt:UtilExecutorListingHack}
at net.minecraft.client.Minecraft.lambda$new$2(Minecraft.java:504) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:itlt:CustomWindowTitle,xf:fml:randompatches:RandomPatches Minecraft Transformer,pl:mixin:APP:shutupexperimentalsettings.mixins.json:client.MixinMinecraft,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMinecraft,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.gui.ResourceLoadProgressGui.func_230430_a_(ResourceLoadProgressGui.java:172) ~[?:?] {re:classloading,xf:OptiFine:default}
at net.minecraft.client.renderer.GameRenderer.func_195458_a(GameRenderer.java:802) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,xf:fml:astralsorcery:reach_set_client_renderer}
at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:976) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:itlt:CustomWindowTitle,xf:fml:randompatches:RandomPatches Minecraft Transformer,pl:mixin:APP:shutupexperimentalsettings.mixins.json:client.MixinMinecraft,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMinecraft,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:itlt:CustomWindowTitle,xf:fml:randompatches:RandomPatches Minecraft Transformer,pl:mixin:APP:shutupexperimentalsettings.mixins.json:client.MixinMinecraft,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMinecraft,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(Main.java:184) ~[1.16.4.jar:?] {re:classloading,pl:runtimedistcleaner:A}
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_242] {}
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_242] {}
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_242] {}
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_242] {}
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) ~[forge-1.16.4-35.1.13.jar:35.1] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.6.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.6.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.0.6.jar:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.0.6.jar:?] {re:classloading}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.0.6.jar:?] {re:classloading}

To Reproduce
Launch the game with any of the mods listed in the crash report (botania as an example)

Mod version and Forge version
Mod Version: 1.0.0 (still present in v 1.0.1)
Forge Version: 35.1.28

full modlist, sol potato is currently disabled because i'm working on a pack in this instance. optifine is present but i also have it happen with it disabled

Done on a clean install with ONLY Spice of Life Potato, got this crash:
Description: Mod loading error has occurred

java.lang.Exception: Mod Loading has failed
at net.minecraftforge.fml.CrashReportExtender.dumpModLoadingCrashReport(CrashReportExtender.java:85) ~[forge:?] {re:classloading}
at net.minecraftforge.fml.client.ClientModLoader.completeModLoading(ClientModLoader.java:188) ~[forge:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.lambda$null$1(Minecraft.java:508) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.util.Util.func_215077_a(SourceFile:404) ~[?:?] {re:classloading}
at net.minecraft.client.Minecraft.lambda$new$2(Minecraft.java:504) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.client.gui.ResourceLoadProgressGui.func_230430_a_(ResourceLoadProgressGui.java:113) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.client.renderer.GameRenderer.func_195458_a(GameRenderer.java:480) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:976) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:607) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(Main.java:184) ~[1.16.4.jar:?] {re:classloading,pl:runtimedistcleaner:A}
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_242] {}
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_242] {}
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_242] {}
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_242] {}
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) ~[forge-1.16.4-35.1.28.jar:35.1] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-8.0.6.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-8.0.6.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-8.0.6.jar:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:82) [modlauncher-8.0.6.jar:?] {}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:66) [modlauncher-8.0.6.jar:?] {}

The only thing I can think of is that I used javafx.util.Pair, which your java installation may not have.

I've updated the code to use org.apache.commons.lang3.tuple.Pair instead, so it shouldn't depend on java installation anymore.

Try updating the mod to 1.01b and see if that fixes the issue.

Just kidding, I uploaded the wrong version to curseforge ;-;

Give me a moment to reupload lol

1.01b works! starts up like a dream!

Huh, thats weird, since I changed one instance of Pair but left another, but glad it works!

Just to be safe, I've just uploaded 1.0.1c, which hopefully should completely fix the issue.

Awesome, thanks for the help!

I am unable to reproduce this with any combination of mods mentioned in the crash log (that is, Botania, Immersive Engineering, Random Patches, and even Optifine). This mod does not use mixin, so I'm not sure what the issue could be.

Can I get your full mod list? (Along with versions)

To be clear, I used the latest versions for all of the aforementioned mods.