MultiMC log says "[main/WARN]: Mod netheritehorsearmor (${version}) does not respect SemVer - comparison support is limited" when I try launching. It then says, "[main/FATAL]: Mixin prepare failed preparing HorseEntityMixin in netheritehorsearmor.mixins.json: org.spongepowered.asm.mixin.transformer.throwables.InvalidMixinException The specified mixin 'com.p3ng00.netheritehorsearmor.mixin.HorseEntityMixin' was not found
org.spongepowered.asm.mixin.transformer.throwables.InvalidMixinException: The specified mixin 'com.p3ng00.netheritehorsearmor.mixin.HorseEntityMixin' was not found
at org.spongepowered.asm.mixin.transformer.MixinInfo.(MixinInfo.java:855) ~[sponge-mixin-0.8.1+build.21.jar:0.8.1+build.21+unknown-b21.git-unknown]
at org.spongepowered.asm.mixin.transformer.MixinConfig.prepareMixins(MixinConfig.java:715) ~[sponge-mixin-0.8.1+build.21.jar:0.8.1+build.21+unknown-b21.git-unknown]
at org.spongepowered.asm.mixin.transformer.MixinConfig.prepare(MixinConfig.java:648) ~[sponge-mixin-0.8.1+build.21.jar:0.8.1+build.21+unknown-b21.git-unknown]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.prepareConfigs(MixinProcessor.java:515) [sponge-mixin-0.8.1+build.21.jar:0.8.1+build.21+unknown-b21.git-unknown]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.select(MixinProcessor.java:440) [sponge-mixin-0.8.1+build.21.jar:0.8.1+build.21+unknown-b21.git-unknown]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.checkSelect(MixinProcessor.java:416) [sponge-mixin-0.8.1+build.21.jar:0.8.1+build.21+unknown-b21.git-unknown]
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:285) [sponge-mixin-0.8.1+build.21.jar:0.8.1+build.21+unknown-b21.git-unknown]
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:191) [sponge-mixin-0.8.1+build.21.jar:0.8.1+build.21+unknown-b21.git-unknown]
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:178) [sponge-mixin-0.8.1+build.21.jar:0.8.1+build.21+unknown-b21.git-unknown]
at org.spongepowered.asm.mixin.transformer.FabricMixinTransformerProxy.transformClassBytes(FabricMixinTransformerProxy.java:23) [fabric-loader-0.9.1+build.205.jar:0.8.1+build.21+unknown-b21.git-unknown]
at net.fabricmc.loader.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:157) [fabric-loader-0.9.1+build.205.jar:?]
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:143) [fabric-loader-0.9.1+build.205.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) [?:1.8.0_261]
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:190) [fabric-loader-0.9.1+build.205.jar:?]
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140) [fabric-loader-0.9.1+build.205.jar:?]
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26) [fabric-loader-0.9.1+build.205.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_261]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_261]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_261]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_261]
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196) [NewLaunch.jar:?]
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231) [NewLaunch.jar:?]
at org.multimc.EntryPoint.listen(EntryPoint.java:143) [NewLaunch.jar:?]
at org.multimc.EntryPoint.main(EntryPoint.java:34) [NewLaunch.jar:?]
Caused by: java.lang.ClassNotFoundException: The specified mixin 'com.p3ng00.netheritehorsearmor.mixin.HorseEntityMixin' was not found
at org.spongepowered.asm.mixin.transformer.MixinInfo.loadMixinClass(MixinInfo.java:1297) ~[sponge-mixin-0.8.1+build.21.jar:0.8.1+build.21+unknown-b21.git-unknown]
at org.spongepowered.asm.mixin.transformer.MixinInfo.(MixinInfo.java:848) ~[sponge-mixin-0.8.1+build.21.jar:0.8.1+build.21+unknown-b21.git-unknown]
... 23 more
Failed to start Minecraft:
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196)
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231)
at org.multimc.EntryPoint.listen(EntryPoint.java:143)
at org.multimc.EntryPoint.main(EntryPoint.java:34)
Caused by: org.spongepowered.asm.mixin.throwables.MixinApplyError: Mixin [netheritehorsearmor.mixins.json:HorseEntityMixin] from phase [DEFAULT] in config [netheritehorsearmor.mixins.json] FAILED during PREPARE
at org.spongepowered.asm.mixin.transformer.MixinProcessor.handleMixinError(MixinProcessor.java:643)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.handleMixinPrepareError(MixinProcessor.java:591)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.prepareConfigs(MixinProcessor.java:518)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.select(MixinProcessor.java:440)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.checkSelect(MixinProcessor.java:416)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:285)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:191)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:178)
at org.spongepowered.asm.mixin.transformer.FabricMixinTransformerProxy.transformClassBytes(FabricMixinTransformerProxy.java:23)
at net.fabricmc.loader.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:157)
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:143)
at java.lang.ClassLoader.loadClass(Unknown Source)
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:190)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)
... 8 more
Caused by: org.spongepowered.asm.mixin.transformer.throwables.InvalidMixinException: The specified mixin 'com.p3ng00.netheritehorsearmor.mixin.HorseEntityMixin' was not found
at org.spongepowered.asm.mixin.transformer.MixinInfo.(MixinInfo.java:855)
at org.spongepowered.asm.mixin.transformer.MixinConfig.prepareMixins(MixinConfig.java:715)
at org.spongepowered.asm.mixin.transformer.MixinConfig.prepare(MixinConfig.java:648)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.prepareConfigs(MixinProcessor.java:515)
... 20 more
Caused by: java.lang.ClassNotFoundException: The specified mixin 'com.p3ng00.netheritehorsearmor.mixin.HorseEntityMixin' was not found
at org.spongepowered.asm.mixin.transformer.MixinInfo.loadMixinClass(MixinInfo.java:1297)
at org.spongepowered.asm.mixin.transformer.MixinInfo.(MixinInfo.java:848)
... 23 more"

I don't know what any of this means. I have all the dependencies mentioned in Curseforge. The same thing happens when I have it on a world with no other mods and a world with 9 other mods.

What version of Minecraft and what version of my mod are you using?

Do you mind uploading the entire log file to a site like Pastebin.com?

I am using the 1.16.2 version of the mod. https://pastebin.com/CMWYBwfM (log).

"[✔️] netherite_horse_armor_v0.4.2_1.16.2-sources"

I found this in your log file. Please install v0.4.2 here (not sources. That's for development)

♥