A mod crashed on startup!

[Suolakissalta]

A mod crashed on startup!
net.fabricmc.loader.impl.FormattedException: java.lang.RuntimeException: Could not execute entrypoint stage 'preLaunch' due to errors, provided by 'advanced_runtime_resource_pack'!
at net.fabricmc.loader.impl.launch.knot.Knot.init(Knot.java:164)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:68)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
Caused by: java.lang.RuntimeException: Could not execute entrypoint stage 'preLaunch' due to errors, provided by 'advanced_runtime_resource_pack'!
at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.lambda$invoke0$0(EntrypointUtils.java:51)
at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33)
at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.invoke0(EntrypointUtils.java:49)
at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.invoke(EntrypointUtils.java:35)
at net.fabricmc.loader.impl.launch.knot.Knot.init(Knot.java:162)
... 2 more
Caused by: net.fabricmc.loader.api.EntrypointException: Exception while loading entries for entrypoint 'preLaunch' provided by 'advanced_runtime_resource_pack'
at net.fabricmc.loader.impl.entrypoint.EntrypointContainerImpl.getEntrypoint(EntrypointContainerImpl.java:56)
at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.invoke0(EntrypointUtils.java:47)
... 4 more
Caused by: java.lang.RuntimeException: Mixin transformation of net.devtech.arrp.ARRP failed
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:414)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:318)
at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218)
at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:145)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:488)
at java.base/java.lang.Class.forName(Class.java:467)
at net.fabricmc.loader.impl.util.DefaultLanguageAdapter.create(DefaultLanguageAdapter.java:50)
at net.fabricmc.loader.impl.entrypoint.EntrypointStorage$NewEntry.getOrCreate(EntrypointStorage.java:117)
at net.fabricmc.loader.impl.entrypoint.EntrypointContainerImpl.getEntrypoint(EntrypointContainerImpl.java:53)
... 5 more
Caused by: org.spongepowered.asm.mixin.throwables.MixinApplyError: Mixin [c2me-opts-worldgen-general.mixins.json:random_instances.MixinRedirectAtomicSimpleRandomStatic from mod c2me-opts-worldgen-general] from phase [DEFAULT] in config [c2me-opts-worldgen-general.mixins.json] FAILED during PREPARE
at org.spongepowered.asm.mixin.transformer.MixinProcessor.handleMixinError(MixinProcessor.java:638)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.handleMixinPrepareError(MixinProcessor.java:585)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.prepareConfigs(MixinProcessor.java:543)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.select(MixinProcessor.java:462)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.checkSelect(MixinProcessor.java:438)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:290)
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:409)
... 15 more
Caused by: org.spongepowered.asm.mixin.transformer.throwables.InvalidMixinException: @mixin target type mismatch: net.minecraft.class_6874 is an interface in org.spongepowered.asm.mixin.transformer.MixinInfo$SubType$Standard@4ce94d2f
at org.spongepowered.asm.mixin.transformer.MixinInfo$SubType.validateTarget(MixinInfo.java:553)
at org.spongepowered.asm.mixin.transformer.MixinInfo.getTargetClass(MixinInfo.java:1027)
at org.spongepowered.asm.mixin.transformer.MixinInfo.readTargetClasses(MixinInfo.java:1008)
at org.spongepowered.asm.mixin.transformer.MixinInfo.parseTargets(MixinInfo.java:896)
at org.spongepowered.asm.mixin.transformer.MixinConfig.prepareMixins(MixinConfig.java:869)
at org.spongepowered.asm.mixin.transformer.MixinConfig.prepare(MixinConfig.java:777)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.prepareConfigs(MixinProcessor.java:540)
... 21 more

[warjort]

Caused by: org.spongepowered.asm.mixin.throwables.MixinApplyError: Mixin [c2me-opts-worldgen-general.mixins.json:random_instances.MixinRedirectAtomicSimpleRandomStatic from mod c2me-opts-worldgen-general] from phase [DEFAULT] in config [c2me-opts-worldgen-general.mixins.json] FAILED during PREPARE
-- snip ---
... 15 more
Caused by: org.spongepowered.asm.mixin.transformer.throwables.InvalidMixinException: @mixin target type mismatch: net.minecraft.class_6874 is an interface in org.spongepowered.asm.mixin.transformer.MixinInfo$SubType$Standard@4ce94d2f

This is an issue with c2me trying but failing to mixin to class_6874, report it to them.

From the error message you probably have a version mismatch somewhere but since you dont post any info about mod or minecraft versions it is hard to help further.

Caused by: net.fabricmc.loader.api.EntrypointException: Exception while loading entries for entrypoint 'preLaunch' provided by 'advanced_runtime_resource_pack'
Caused by: java.lang.RuntimeException: Mixin transformation of net.devtech.arrp.ARRP failed

The actual error is in special/early processing of the ARRP mod and the failing mixin is a redirect, so this could be an incompatibilty between mods?