Game crash on load with recent version of mod (Fabric, 1.21.5)

[RustinPlays]

Text format here:

[16:06:04] [main] [FabricLoader/ERROR]: A mod crashed on startup! -- 376 | net.fabricmc.loader.impl.FormattedException: java.lang.RuntimeException: Could not execute entrypoint stage 'preLaunch' due to errors, provided by 'image2map' at 'space.essem.image2map.CardboardWarning'! 377 | at net.fabricmc.loader.impl.FormattedException.ofLocalized(FormattedException.java:63) 378 | at net.fabricmc.loader.impl.launch.knot.Knot.init(Knot.java:162) 379 | at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:68) 380 | at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) 381 | Caused by: java.lang.RuntimeException: Could not execute entrypoint stage 'preLaunch' due to errors, provided by 'image2map' at 'space.essem.image2map.CardboardWarning'! 382 | at net.fabricmc.loader.impl.FabricLoaderImpl.lambda$invokeEntrypoints$2(FabricLoaderImpl.java:403) 383 | at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33) 384 | at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:401) 385 | at net.fabricmc.loader.impl.launch.knot.Knot.init(Knot.java:160) 386 | ... 2 more 387 | Caused by: net.fabricmc.loader.api.EntrypointException: Exception while loading entries for entrypoint 'preLaunch' provided by 'image2map' 388 | at net.fabricmc.loader.impl.entrypoint.EntrypointContainerImpl.getEntrypoint(EntrypointContainerImpl.java:56) 389 | at net.fabricmc.loader.impl.FabricLoaderImpl.invokeEntrypoints(FabricLoaderImpl.java:399) 390 | ... 3 more 391 | Caused by: java.lang.RuntimeException: Mixin transformation of space.essem.image2map.CardboardWarning failed 392 | at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:427) 393 | at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323) 394 | at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) 395 | at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119) 396 | at java.base/java.lang.ClassLoader.loadClass(Unknown Source) 397 | at java.base/java.lang.Class.forName0(Native Method) 398 | at java.base/java.lang.Class.forName(Unknown Source) 399 | at java.base/java.lang.Class.forName(Unknown Source) 400 | at net.fabricmc.loader.impl.util.DefaultLanguageAdapter.create(DefaultLanguageAdapter.java:50) 401 | at net.fabricmc.loader.impl.entrypoint.EntrypointStorage$NewEntry.getOrCreate(EntrypointStorage.java:124) 402 | at net.fabricmc.loader.impl.entrypoint.EntrypointContainerImpl.getEntrypoint(EntrypointContainerImpl.java:53) 403 | ... 4 more 404 | Caused by: org.spongepowered.asm.mixin.throwables.MixinApplyError: Mixin [skipservercheck.mixins.json:ServerPlayNetworkHandlerMixin from mod skipservercheck] from phase [DEFAULT] in config [skipservercheck.mixins.json] FAILED during PREPARE 405 | at org.spongepowered.asm.mixin.transformer.MixinProcessor.handleMixinError(MixinProcessor.java:638) 406 | at org.spongepowered.asm.mixin.transformer.MixinProcessor.handleMixinPrepareError(MixinProcessor.java:585) 407 | at org.spongepowered.asm.mixin.transformer.MixinProcessor.prepareConfigs(MixinProcessor.java:543) 408 | at org.spongepowered.asm.mixin.transformer.MixinProcessor.select(MixinProcessor.java:462) 409 | at org.spongepowered.asm.mixin.transformer.MixinProcessor.checkSelect(MixinProcessor.java:438) 410 | at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:290) 411 | at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:234) 412 | at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:202) 413 | at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:422) 414 | ... 14 more 415 | Caused by: org.spongepowered.asm.mixin.transformer.throwables.InvalidMixinException: Cannot load class net.frostbyte.skipservercheck.mixin.ServerPlayNetworkHandlerMixin in environment type CLIENT 416 | at org.spongepowered.asm.mixin.transformer.MixinInfo.(MixinInfo.java:864) 417 | at org.spongepowered.asm.mixin.transformer.MixinConfig.prepareMixins(MixinConfig.java:933) 418 | at org.spongepowered.asm.mixin.transformer.MixinConfig.prepare(MixinConfig.java:858) 419 | at org.spongepowered.asm.mixin.transformer.MixinProcessor.prepareConfigs(MixinProcessor.java:540) 420 | ... 20 more 421 | Caused by: java.lang.RuntimeException: Cannot load class net.frostbyte.skipservercheck.mixin.ServerPlayNetworkHandlerMixin in environment type CLIENT 422 | at net.fabricmc.loader.impl.transformer.FabricTransformer.transform(FabricTransformer.java:59) 423 | at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPreMixinClassByteArray(KnotClassDelegate.java:462) 424 | at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPreMixinClassBytes(KnotClassDelegate.java:433) 425 | at net.fabricmc.loader.impl.launch.knot.Knot.getClassByteArray(Knot.java:318) 426 | at net.fabricmc.loader.impl.launch.knot.MixinServiceKnot.getClassBytes(MixinServiceKnot.java:60) 427 | at net.fabricmc.loader.impl.launch.knot.MixinServiceKnot.getClassNode(MixinServiceKnot.java:81) 428 | at org.spongepowered.asm.mixin.transformer.MixinInfo.loadMixinClass(MixinInfo.java:1316) 429 | at org.spongepowered.asm.mixin.transformer.MixinInfo.(MixinInfo.java:857) 430 | ... 23 more 431 | [16:06:04] [main] [FabricLoader/ERROR]: A mod crashed on startup!

[IDoTheHax]

Bug is in skipservercheck is applying a serverside mixin on the client

You can remove the skipservercheck mod as its incompatible with client-side usage or contact the dev to patch it