[1.20.1+forge+arclight] Error when loading

[Andy-Elizabeth-mouse]

When using the arclight server and this mod, the following error occurs during server startup:

[mixin]: Mixin prepare failed preparing network.chat.ComponentMixin in mixins.arclight.core.json: org.spongepowered.asm.mixin.transformer.throwables.MixinTargetAlreadyLoadedException Critical problem: mixins.arclight.core.json:network.chat.ComponentMixin target net.minecraft.network.chat.Component was loaded too early.
org.spongepowered.asm.mixin.transformer.throwables.MixinTargetAlreadyLoadedException: Critical problem: mixins.arclight.core.json:network.chat.ComponentMixin target net.minecraft.network.chat.Component was loaded too early.
        at org.spongepowered.asm.mixin.transformer.MixinInfo.readDeclaredTargets(MixinInfo.java:947) ~[mixin-0.8.5.jar%2399!/:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4]
        at org.spongepowered.asm.mixin.transformer.MixinInfo.<init>(MixinInfo.java:881) ~[mixin-0.8.5.jar%2399!/:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4]
        at org.spongepowered.asm.mixin.transformer.MixinConfig.prepareMixins(MixinConfig.java:850) ~[mixin-0.8.5.jar%2399!/:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4]
        at org.spongepowered.asm.mixin.transformer.MixinConfig.prepare(MixinConfig.java:775) ~[mixin-0.8.5.jar%2399!/:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4]
        at org.spongepowered.asm.mixin.transformer.MixinProcessor.prepareConfigs(MixinProcessor.java:539) ~[mixin-0.8.5.jar%2399!/:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4]
        at org.spongepowered.asm.mixin.transformer.MixinProcessor.select(MixinProcessor.java:462) ~[mixin-0.8.5.jar%2399!/:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4]
        at org.spongepowered.asm.mixin.transformer.MixinProcessor.checkSelect(MixinProcessor.java:438) ~[mixin-0.8.5.jar%2399!/:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4]
        at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:290) ~[mixin-0.8.5.jar%2399!/:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4]
        at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:250) ~[mixin-0.8.5.jar%2399!/:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4]
        at org.spongepowered.asm.service.modlauncher.MixinTransformationHandler.processClass(MixinTransformationHandler.java:131) ~[mixin-0.8.5.jar%2399!/:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4]
        at org.spongepowered.asm.launch.MixinLaunchPluginLegacy.processClass(MixinLaunchPluginLegacy.java:131) ~[mixin-0.8.5.jar%2399!/:0.8.5+Jenkins-b310.git-155314e6e91465dad727e621a569906a410cd6f4]
        at cpw.mods.modlauncher.serviceapi.ILaunchPluginService.processClassWithFlags(ILaunchPluginService.java:156) ~[modlauncher-10.0.9.jar%2389!/:10.0.9+10.0.9+main.dcd20f30]
        at cpw.mods.modlauncher.LaunchPluginHandler.offerClassNodeToPlugins(LaunchPluginHandler.java:88) ~[modlauncher-10.0.9.jar%2389!/:?]
        at cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:120) ~[modlauncher-10.0.9.jar%2389!/:?]
        at cpw.mods.modlauncher.TransformingClassLoader.maybeTransformClassBytes(TransformingClassLoader.java:50) ~[modlauncher-10.0.9.jar%2389!/:?]
        at cpw.mods.cl.ModuleClassLoader.readerToClass(ModuleClassLoader.java:113) ~[securejarhandler-2.1.10.jar:?]
        at cpw.mods.cl.ModuleClassLoader.lambda$findClass$15(ModuleClassLoader.java:219) ~[securejarhandler-2.1.10.jar:?]
        at cpw.mods.cl.ModuleClassLoader.loadFromModule(ModuleClassLoader.java:229) ~[securejarhandler-2.1.10.jar:?]
        at cpw.mods.cl.ModuleClassLoader.findClass(ModuleClassLoader.java:219) ~[securejarhandler-2.1.10.jar:?]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:638) ~[?:?]
        at java.lang.Class.forName(Class.java:625) ~[?:?]
        at java.lang.Class.forName(Class.java:600) ~[?:?]
        at net.minecraftforge.fml.loading.ImmediateWindowHandler$DummyProvider.lambda$updateModuleReads$1(ImmediateWindowHandler.java:145) ~[fmlloader-1.20.1-47.4.10.jar%23103!/:1.0]
        at java.util.Optional.map(Optional.java:260) ~[?:?]
        at net.minecraftforge.fml.loading.ImmediateWindowHandler$DummyProvider.updateModuleReads(ImmediateWindowHandler.java:145) ~[fmlloader-1.20.1-47.4.10.jar%23103!/:1.0]
        at net.minecraftforge.fml.loading.ImmediateWindowHandler.acceptGameLayer(ImmediateWindowHandler.java:71) ~[fmlloader-1.20.1-47.4.10.jar%23103!/:1.0]
        at net.minecraftforge.fml.loading.FMLLoader.beforeStart(FMLLoader.java:216) ~[fmlloader-1.20.1-47.4.10.jar%23103!/:1.0]
        at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.launchService(CommonLaunchHandler.java:92) ~[fmlloader-1.20.1-47.4.10.jar%23103!/:?]
        at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) ~[modlauncher-10.0.9.jar%2389!/:?]
        at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) ~[modlauncher-10.0.9.jar%2389!/:?]
        at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) ~[modlauncher-10.0.9.jar%2389!/:?]
        at cpw.mods.modlauncher.Launcher.run(Launcher.java:108) ~[modlauncher-10.0.9.jar%2389!/:?]
        at cpw.mods.modlauncher.Launcher.main(Launcher.java:78) ~[modlauncher-10.0.9.jar%2389!/:?]
        at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) ~[modlauncher-10.0.9.jar%2389!/:?]
        at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) ~[modlauncher-10.0.9.jar%2389!/:?]
        at io.izzel.arclight.boot.application.ApplicationBootstrap.accept(ApplicationBootstrap.java:46) ~[server-release-updated.jar:arclight-1.20.1-1.0.6-SNAPSHOT-084a30f]
        at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[?:?]
        at java.lang.reflect.Method.invoke(Method.java:580) ~[?:?]
        at io.izzel.arclight.boot.application.BootstrapTransformer.onInvoke$BootstrapLauncher(BootstrapTransformer.java:26) ~[server-release-updated.jar:arclight-1.20.1-1.0.6-SNAPSHOT-084a30f]
        at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) ~[bootstraplauncher-1.1.2.jar:?]
        at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[?:?]
        at java.lang.reflect.Method.invoke(Method.java:580) ~[?:?]
        at io.izzel.arclight.boot.application.Main_Forge.main(Main_Forge.java:33) ~[server-release-updated.jar%2383!/:?]
        at io.izzel.arclight.server.Launcher.main(Launcher.java:18) ~[server-release-updated.jar%2383!/:?]

It is suspected that this mod loaded the net.minecraft.network.chat.Component class before arclight performed mixin, causing arclight's mixin to fail. I'm not sure whether this is an issue with this mod or with arclight.

[Andy-Elizabeth-mouse]

solved after updating src\main\java\uk\co\hexeption\rsinfinitybooster\RSInfinityBooster.java:

package uk.co.hexeption.rsinfinitybooster;

import net.minecraft.core.Registry;
import net.minecraft.core.registries.Registries;
import net.minecraft.network.chat.Component;
import net.minecraft.resources.ResourceLocation;
import net.minecraft.world.item.CreativeModeTab;
import net.minecraft.world.item.Item;
import net.minecraft.world.item.ItemStack;
import net.minecraftforge.eventbus.api.IEventBus;
import net.minecraftforge.fml.ModList;
import net.minecraftforge.fml.ModLoadingContext;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.config.ModConfig;
import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
import net.minecraftforge.fml.loading.LoadingModList;
import net.minecraftforge.fml.loading.moddiscovery.ModInfo;
import net.minecraftforge.registries.DeferredRegister;
import net.minecraftforge.registries.RegisterEvent;
import net.minecraftforge.registries.RegistryObject;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import uk.co.hexeption.rsinfinitybooster.config.ServerConfig;
import uk.co.hexeption.rsinfinitybooster.setup.ModItems;
import uk.co.hexeption.rsinfinitybooster.setup.Registration;

import java.lang.reflect.Field;

// The value here should match an entry in the META-INF/mods.toml file
@Mod("rsinfinitybooster")
public class RSInfinityBooster {

    public static final String ID = "rsinfinitybooster";
    public static final ServerConfig SERVER_CONFIG = new ServerConfig();
    
    public static class ModTabs {
        public static final DeferredRegister<CreativeModeTab> CREATIVE_MODE_TABS = DeferredRegister.create(Registries.CREATIVE_MODE_TAB, ID);
        public static final RegistryObject<CreativeModeTab> RS_INFINITY_BOOSTER_TAB = CREATIVE_MODE_TABS.register("aeinfinitybooster", () -> CreativeModeTab.builder()
                .icon(() -> new ItemStack(ModItems.INFINITY_CARD.get()))
                .title(Component.translatable("item_group." + ID + ".tab"))
                .displayItems((itemDisplayParameters, output) -> {
                    for (Field field : ModItems.class.getFields()) {
                        if (field.getType() != RegistryObject.class) continue;

                        try {
                            RegistryObject<Item> item = (RegistryObject<Item>) field.get(null);
                            output.accept(new ItemStack(item.get()));
                        } catch (IllegalAccessException e) {
                        }
                    }
                })
                .build());
    }

    public RSInfinityBooster() {

        ModLoadingContext.get().registerConfig(ModConfig.Type.SERVER, SERVER_CONFIG.getSpec());

        Registration.register();

        IEventBus eventBus = FMLJavaModLoadingContext.get().getModEventBus();
        ModTabs.CREATIVE_MODE_TABS.register(eventBus);
        // eventBus.addListener((RegisterEvent event) -> {
        //     if (event.getRegistryKey() == Registries.CREATIVE_MODE_TAB) {
        //         registerTab(event.getVanillaRegistry());
        //     }
        // });
    }


    // public static void registerTab(Registry<CreativeModeTab> registry) {
    //     var tab = CreativeModeTab.builder()
    //             .icon(() -> new ItemStack(ModItems.INFINITY_CARD.get()))
    //             .displayItems((itemDisplayParameters, output) -> {

    //                         for (Field field : ModItems.class.getFields()) {
    //                             if (field.getType() != RegistryObject.class) continue;

    //                             try {
    //                                 RegistryObject<Item> item = (RegistryObject<Item>) field.get(null);
    //                                 output.accept(new ItemStack(item.get()));
    //                             } catch (IllegalAccessException e) {
    //                             }
    //                         }

    //                     }
    //             )
    //             .title(Component.translatable("item_group." + ID + ".tab"))
    //             .build();
    //     Registry.register(registry, new ResourceLocation(ID, "aeinfinitybooster"), tab);

    // }

    // From AE https://github.com/AppliedEnergistics/Applied-Energistics-2/blob/3552335d5d06dccd4f717510eda8bc7a39937a9e/src/main/java/appeng/mixins/ConfigPlugin.java#L52
    public static boolean isModLoaded(String modId) {
        if (ModList.get() == null) {
            return LoadingModList.get().getMods().stream().map(ModInfo::getModId).anyMatch(modId::equals);
        }
        return ModList.get().isLoaded(modId);
    }
}