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Accessor with implicit lowercase single letter target conflicts with accessor with explicit lowercase single letter target #120

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Accessor with implicit lowercase single letter target conflicts with accessor with explicit lowercase single letter target#120
@kevinthegreat1

Description

@kevinthegreat1
kevinthegreat1
opened on Sep 23, 2023

Description

When two accessors target the same lowercase single-letter field, one with implicit name and one with an explicit name, such as below, the game crashes with the following error:

Mod A:

@Accessor("x")
int getX();

Mod B:

@Accessor
int getX();

Error

Logs 

[Render thread/ERROR] (FabricLoader/Mixin) Mixin apply for mod skyblocker failed skyblocker.mixins.json:accessor.HandledScreenAccessor from mod skyblocker -> net.minecraft.client.gui.screen.ingame.HandledScreen: org.spongepowered.asm.mixin.transformer.throwables.InvalidMixinException Incompatible @Accessor getX (for X:I) in skyblocker.mixins.json:accessor.HandledScreenAccessor from mod skyblocker previously written by dev.emi.emi.mixin.accessor.HandledScreenAccessor (for x:I) [ -> INJECT Applicator Phase -> skyblocker.mixins.json:accessor.HandledScreenAccessor from mod skyblocker -> Apply Accessors]
 org.spongepowered.asm.mixin.transformer.throwables.InvalidMixinException: Incompatible @Accessor getX (for X:I) in skyblocker.mixins.json:accessor.HandledScreenAccessor from mod skyblocker previously written by dev.emi.emi.mixin.accessor.HandledScreenAccessor (for x:I) [ -> INJECT Applicator Phase -> skyblocker.mixins.json:accessor.HandledScreenAccessor from mod skyblocker -> Apply Accessors]
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.isAlreadyMerged(MixinApplicatorStandard.java:650) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.mergeMethod(MixinApplicatorStandard.java:560) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyAccessors(MixinApplicatorStandard.java:1074) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyMixin(MixinApplicatorStandard.java:400) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:327) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.TargetClassContext.apply(TargetClassContext.java:421) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:403) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:363) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:234) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:202) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:422) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:1012) ~[?:?]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:153) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:355) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:1012) ~[?:?]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:153) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:355) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at net.minecraft.client.main.Main.main(Main.java:211) ~[minecraft-merged-project-root-1.20.1-net.fabricmc.yarn.1_20_1.1.20.1+build.10-v2.jar:?]
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:468) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.devlaunchinjector.Main.main(Main.java:86) ~[dev-launch-injector-0.2.1+build.8.jar:?]
[Render thread/ERROR] (FabricLoader/Mixin) Mixin apply for mod skyblocker failed skyblocker.mixins.json:accessor.HandledScreenAccessor from mod skyblocker -> net.minecraft.client.gui.screen.ingame.HandledScreen: org.spongepowered.asm.mixin.transformer.throwables.InvalidMixinException Incompatible @Accessor getX (for X:I) in skyblocker.mixins.json:accessor.HandledScreenAccessor from mod skyblocker previously written by dev.emi.emi.mixin.accessor.HandledScreenAccessor (for x:I) [ -> INJECT Applicator Phase -> skyblocker.mixins.json:accessor.HandledScreenAccessor from mod skyblocker -> Apply Accessors]
 org.spongepowered.asm.mixin.transformer.throwables.InvalidMixinException: Incompatible @Accessor getX (for X:I) in skyblocker.mixins.json:accessor.HandledScreenAccessor from mod skyblocker previously written by dev.emi.emi.mixin.accessor.HandledScreenAccessor (for x:I) [ -> INJECT Applicator Phase -> skyblocker.mixins.json:accessor.HandledScreenAccessor from mod skyblocker -> Apply Accessors]
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.isAlreadyMerged(MixinApplicatorStandard.java:650) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.mergeMethod(MixinApplicatorStandard.java:560) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyAccessors(MixinApplicatorStandard.java:1074) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyMixin(MixinApplicatorStandard.java:400) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:327) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.TargetClassContext.apply(TargetClassContext.java:421) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:403) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:363) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:234) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:202) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:422) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:1012) ~[?:?]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:153) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:355) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:1012) ~[?:?]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:153) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:355) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at net.minecraft.client.main.Main.main(Main.java:220) ~[minecraft-merged-project-root-1.20.1-net.fabricmc.yarn.1_20_1.1.20.1+build.10-v2.jar:?]
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:468) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.devlaunchinjector.Main.main(Main.java:86) ~[dev-launch-injector-0.2.1+build.8.jar:?]
[Render thread/ERROR] (FabricLoader) Minecraft has crashed!
 net.fabricmc.loader.impl.FormattedException: java.lang.RuntimeException: Mixin transformation of net.minecraft.client.gui.screen.ingame.HandledScreen failed
	at net.fabricmc.loader.impl.FormattedException.ofLocalized(FormattedException.java:63) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:470) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.devlaunchinjector.Main.main(Main.java:86) ~[dev-launch-injector-0.2.1+build.8.jar:?]
Caused by: java.lang.RuntimeException: Mixin transformation of net.minecraft.client.gui.screen.ingame.HandledScreen failed
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:427) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:1012) ~[?:?]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:153) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:355) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:1012) ~[?:?]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:153) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:355) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at net.minecraft.client.main.Main.main(Main.java:220) ~[minecraft-merged-project-root-1.20.1-net.fabricmc.yarn.1_20_1.1.20.1+build.10-v2.jar:?]
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:468) ~[fabric-loader-0.14.21.jar:?]
	... 3 more
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) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:234) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:202) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:422) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:1012) ~[?:?]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:153) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:355) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:1012) ~[?:?]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:153) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:355) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at net.minecraft.client.main.Main.main(Main.java:220) ~[minecraft-merged-project-root-1.20.1-net.fabricmc.yarn.1_20_1.1.20.1+build.10-v2.jar:?]
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:468) ~[fabric-loader-0.14.21.jar:?]
	... 3 more
Caused by: org.spongepowered.asm.mixin.throwables.MixinApplyError: Mixin [skyblocker.mixins.json:accessor.HandledScreenAccessor from mod skyblocker] from phase [DEFAULT] in config [skyblocker.mixins.json] FAILED during APPLY
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.handleMixinError(MixinProcessor.java:638) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.handleMixinApplyError(MixinProcessor.java:589) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:379) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:234) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:202) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:422) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:1012) ~[?:?]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:153) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:355) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:1012) ~[?:?]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:153) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:355) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at net.minecraft.client.main.Main.main(Main.java:220) ~[minecraft-merged-project-root-1.20.1-net.fabricmc.yarn.1_20_1.1.20.1+build.10-v2.jar:?]
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:468) ~[fabric-loader-0.14.21.jar:?]
	... 3 more
Caused by: org.spongepowered.asm.mixin.transformer.throwables.InvalidMixinException: Incompatible @Accessor getX (for X:I) in skyblocker.mixins.json:accessor.HandledScreenAccessor from mod skyblocker previously written by dev.emi.emi.mixin.accessor.HandledScreenAccessor (for x:I) [ -> INJECT Applicator Phase -> skyblocker.mixins.json:accessor.HandledScreenAccessor from mod skyblocker -> Apply Accessors]
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.isAlreadyMerged(MixinApplicatorStandard.java:650) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.mergeMethod(MixinApplicatorStandard.java:560) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyAccessors(MixinApplicatorStandard.java:1074) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyMixin(MixinApplicatorStandard.java:400) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:327) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.TargetClassContext.apply(TargetClassContext.java:421) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:403) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:363) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:234) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:202) ~[sponge-mixin-0.12.5+mixin.0.8.5.jar:0.12.5+mixin.0.8.5]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:422) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:1012) ~[?:?]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:153) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:355) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:?]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:1012) ~[?:?]
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) ~[?:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.defineClassFwd(KnotClassLoader.java:153) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:355) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218) ~[fabric-loader-0.14.21.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:112) ~[fabric-loader-0.14.21.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:520) ~[?:?]
	at net.minecraft.client.main.Main.main(Main.java:220) ~[minecraft-merged-project-root-1.20.1-net.fabricmc.yarn.1_20_1.1.20.1+build.10-v2.jar:?]
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:468) ~[fabric-loader-0.14.21.jar:?]
	... 3 more

Reproduction

This repo can be used to reproduce the issue.

Analysis

It seems like AccessorInfo#inflectTarget always returns X for Mod B's accessor, while the name is x for Mod A's accessor. While Mod B's accessor works fine by itself, (mixin somehow finds the right field even though AccessorInfo#inflectTarget returns a captical X), having both accessors does not work. Since MixinApplicatorStandard#isAlreadyMerged directly compares the targets for both accessors, which is x:I for Mod A and X:I for Mod B. Since the targets are not the same, an InvalidMixinException is thrown on line 580 of MixinApplicatorStandard.

Here is a message from the fabric discord about this.

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