Textures not loading properly

[Dripan]

I just started out with mods, and I was trying to make some basic items. I got the items to load into the game but I cannot figure out what is wrong with the textures and why they are not loading. I checked the folder structure and the contents of the json files more than 5 times and I could not find anything misplaced or mistyped. I would greatly appreciate any help.
Items class

package com.raresamza.firstmod.item;


import com.raresamza.firstmod.FirstMod;

import net.minecraft.world.item.Item;
import net.minecraftforge.eventbus.api.IEventBus;
import net.minecraftforge.registries.DeferredRegister;
import net.minecraftforge.registries.ForgeRegistries;
import net.minecraftforge.registries.RegistryObject;

import static com.raresamza.firstmod.item.ModCustomCreativeTab.*;

public class ModItems {

    public static final DeferredRegister<Item> ITEMS=DeferredRegister.create(ForgeRegistries.ITEMS, FirstMod.MOD_ID);
    public static final RegistryObject<Item> PLUTONIUM = addToTab(ITEMS.register
            ("plutonium",
                    ()->new Item(new Item.Properties().stacksTo(32))));

    public static final RegistryObject<Item> RAW_PLUTONIUM = addToTab(ITEMS.register
            ("raw_plutonium",
                    ()->new Item(new Item.Properties().stacksTo(32))));

    public static final RegistryObject<Item> ZIRCON = ITEMS.register("zircon",
            () -> new Item(new Item.Properties()));
    public static final RegistryObject<Item> RAW_ZIRCON = ITEMS.register("raw_zircon",
            () -> new Item(new Item.Properties()));


    public static void register(IEventBus eventBus) {
        ITEMS.register(eventBus);
    }
}

Custom creative tab
 

package com.raresamza.firstmod.item;

import com.raresamza.firstmod.FirstMod;
import net.minecraft.core.registries.Registries;
import net.minecraft.network.chat.Component;
import net.minecraft.world.item.*;
import net.minecraft.world.level.ItemLike;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.event.BuildCreativeModeTabContentsEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.registries.DeferredRegister;
import net.minecraftforge.registries.RegistryObject;

import java.util.ArrayList;
import java.util.List;
import java.util.function.Supplier;

@Mod.EventBusSubscriber(modid = FirstMod.MOD_ID,bus = Mod.EventBusSubscriber.Bus.MOD,value = Dist.CLIENT)
public class ModCustomCreativeTab {
    public static final DeferredRegister<CreativeModeTab> TABS=DeferredRegister.create(Registries.CREATIVE_MODE_TAB, FirstMod.MOD_ID);
    public static final List<Supplier<?extends ItemLike>> MOD_TAB_ITEMS=new ArrayList<>();

    public static final RegistryObject<CreativeModeTab> SPECIAL_TAB=TABS.register("modtab",
            ()-> CreativeModeTab.builder()
                    .title(Component.translatable("itemGroup.modtab"))
                    .icon(ModItems.PLUTONIUM.get()::getDefaultInstance)
                    .displayItems((displayParams,output)->
                        MOD_TAB_ITEMS.forEach(itemLike -> output.accept(itemLike.get())))
                    .build());

    public static <T extends Item> RegistryObject<T> addToTab(RegistryObject<T> itemLike) {
        MOD_TAB_ITEMS.add(itemLike);
        return itemLike;
    }

    @SubscribeEvent
    public static void buildContents(BuildCreativeModeTabContentsEvent event) {
        if(event.getTabKey()== CreativeModeTabs.BUILDING_BLOCKS) {
            event.accept(ModItems.PLUTONIUM);
            event.accept(ModItems.RAW_PLUTONIUM);
            event.accept(ModItems.ZIRCON);
            event.accept(ModItems.RAW_ZIRCON);
        }
        if(event.getTab()==SPECIAL_TAB.get()) {
            event.accept(Items.APPLE);
            event.accept(ModItems.PLUTONIUM);
            event.accept(ModItems.RAW_PLUTONIUM);
            event.accept(ModItems.ZIRCON);
            event.accept(ModItems.RAW_ZIRCON);
        }
    }
}

raw_plutonium.json

{
  "parent": "minecraft:item/generated",
  "textures": {
    "layer0": "firstmod:item/raw_plutonium"
  }
}

plutonium.json

{
  "parent": "minecraft:item/generated",
  "textures": {
    "layer0": "firstmod:item/plutonium"
  }
}

I would like to include a screenshot of the resource folder structure in case I might have somehow misplaced something but I couldn't find how to paste the image. Also, I have read other threads on this but it did not help, couldn't find anything wrong with my code.

[Zacomat]

Your textures path should be for example resources/assets/firstmod/textures/item/plutonium.png

and your mod id must be firstmod

[Dripan]

Just now, Zacomat said:

Your textures path should be for example resources/assets/firstmod/textures/item/plutonium.png

and your mod id must be firstmod

the mod id is firstmod and the folder structure is the same as the one you have mentioned

 

[EveryBlu]

Are you sure "layer0" points to a valid item texture? If a json item model doesn't use an existing image file for it's texture(s), then it will have the purple and black checkerboard texture.