Big Machine Main with texture issue

package com.sirscruffybeard.bigmachines;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import com.sirscruffybeard.bigmachines.items.ModItems;
import com.sirscruffybeard.bigmachines.util.Reference;
import net.minecraft.item.Item;
import net.minecraft.util.ResourceLocation;
import net.minecraft.item.ItemGroup;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.event.RegistryEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.event.lifecycle.FMLCommonSetupEvent;
import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;

@Mod(Reference.MOD_ID)
public class BigMachines {

	public static BigMachines instance;

	public static final String modid = Reference.MOD_ID;

	private static final Logger logger = LogManager.getLogger(modid);

	public BigMachines() {

		instance = this;

		MinecraftForge.EVENT_BUS.register(this);

		FMLJavaModLoadingContext.get().getModEventBus().addListener(this::setup);
		FMLJavaModLoadingContext.get().getModEventBus().addListener(this::clientRegisteries);

	}//BigMachines()

	private void setup(final FMLCommonSetupEvent event) {

		logger.info("setup method registered");
	}

	private void clientRegisteries(final FMLCommonSetupEvent event) {

		logger.info("clientRegisteries method registered");
	}

	@Mod.EventBusSubscriber(bus=Mod.EventBusSubscriber.Bus.MOD)
	public static class RegistryEvents {

		@SubscribeEvent
		public static void registerItems(final RegistryEvent.Register<Item> event) {

			event.getRegistry().registerAll(

			ModItems.iron_rivet_item = new Item(new Item.Properties().group(ItemGroup.MATERIALS)).setRegistryName(setLocation("iron_rivet_item"))

			);

			logger.info("Items registered");
		}

		public static ResourceLocation setLocation(String name) {

			return new ResourceLocation(Reference.MOD_ID, name);
		}

	}

}//public class BigMachines