[1.18.2] Caused by: java.lang.NullPointerException: Cannot read field "mending" because "us.blueeyemods.uem.Main.config" is null

[TheOneWithBlueEyes]

package us.blueeyemods.uem;

import dev.toma.configuration.Configuration;
import dev.toma.configuration.config.format.ConfigFormats;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.eventbus.api.IEventBus;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
import us.blueeyemods.uem.config.ModConfig;

@SuppressWarnings("unused")
@Mod(Main.MODID)
public class Main {
    public static final String MODID = "uem";

    public static ModConfig config;

    public Main() {
        IEventBus eventBus = FMLJavaModLoadingContext.get().getModEventBus();
        MinecraftForge.EVENT_BUS.register(this);
        config = Configuration.registerConfig(ModConfig.class, ConfigFormats.json()).getConfigInstance();
    }
}

I don't understand why this is throwing a null pointer exception when I use this in my mixin:

package us.blueeyemods.uem.mixin.mending;

import net.minecraft.world.entity.EquipmentSlot;
import net.minecraft.world.item.enchantment.Enchantment;
import net.minecraft.world.item.enchantment.EnchantmentCategory;
import net.minecraft.world.item.enchantment.MendingEnchantment;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.injection.At;
import org.spongepowered.asm.mixin.injection.Inject;
import org.spongepowered.asm.mixin.injection.ModifyArg;
import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
import us.blueeyemods.uem.Main;

@Mixin(MendingEnchantment.class)
public class MendingMixin {
    int field_1 = Main.config.mending.MAXIMUM_ENCHANTMENT_LEVEL;
    boolean field_2 = Main.config.mending.TREASURE_ONLY;

    private static Enchantment.Rarity field_3 = Main.config.mending.ENCHANTMENT_RARITY;

    private static EnchantmentCategory field_4 = Main.config.mending.ENCHANTMENT_CATEGORY;

    private static EquipmentSlot[] field_5 = Main.config.mending.EQUIPMENT_SLOTS;
    @Inject(
            method = {"getMaxLevel"},
            at = {@At("RETURN")},
            cancellable = true
    )
    public void betterenchantments$getMaxLevel(CallbackInfoReturnable<Integer> cir) {
            cir.setReturnValue(Math.min(field_1, 255));
    }
    @Inject(
            method = {"isTreasureOnly"},
            at = {@At("RETURN")},
            cancellable = true
    )
    public void betterenchantments$isTreasureOnly(CallbackInfoReturnable<Boolean> cir) {
            cir.setReturnValue(field_2);
    }
    @ModifyArg(
            method = {"<init>"},
            at = @At(
                    value = "INVOKE",
                    target = "Lnet/minecraft/world/item/enchantment/Enchantment;" +
                            "<init>(Lnet/minecraft/world/item/enchantment/Enchantment$Rarity;" +
                            "Lnet/minecraft/world/item/enchantment/EnchantmentCategory;" +
                            "[Lnet/minecraft/world/entity/EquipmentSlot;)V"
            ),
            index = 0
    )
    private static Enchantment.Rarity betterenchantments$modifyEnchantmentRarity(Enchantment.Rarity weight) {
        return field_3;
    }
    @ModifyArg(
            method = {"<init>"},
            at = @At(
                    value = "INVOKE",
                    target = "Lnet/minecraft/world/item/enchantment/Enchantment;" +
                            "<init>(Lnet/minecraft/world/item/enchantment/Enchantment$Rarity;" +
                            "Lnet/minecraft/world/item/enchantment/EnchantmentCategory;" +
                            "[Lnet/minecraft/world/entity/EquipmentSlot;)V"
            ),
            index = 1
    )
    private static EnchantmentCategory betterenchantments$modifyEnchantmentCategory(EnchantmentCategory pCategory) {
        return field_4;
    }
    @ModifyArg(
            method = {"<init>"},
            at = @At(
                    value = "INVOKE",
                    target = "Lnet/minecraft/world/item/enchantment/Enchantment;" +
                            "<init>(Lnet/minecraft/world/item/enchantment/Enchantment$Rarity;" +
                            "Lnet/minecraft/world/item/enchantment/EnchantmentCategory;" +
                            "[Lnet/minecraft/world/entity/EquipmentSlot;)V"
            ),
            index = 2
    )
    private static EquipmentSlot[] betterenchantments$modifyEnchantmentSlots(EquipmentSlot[] pApplicableSlots) {
        return field_5;
    }
}

What went wrong?

[warjort]

Mixins are not supported here.

Try the 3rd party modding channel on forge's discord or wherever mixin provides support.