Minecraft Forge Problem

package xyz.zhc.elements;

import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.client.renderer.block.model.ModelResourceLocation;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.item.Item;
import net.minecraft.item.ItemBlock;
import net.minecraftforge.client.event.ModelRegistryEvent;
import net.minecraftforge.client.model.ModelLoader;
import net.minecraftforge.event.RegistryEvent;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.common.Mod.EventHandler;
import net.minecraftforge.fml.common.event.FMLInitializationEvent;
import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;

@Mod(modid = Elements.MODID, name = Elements.NAME, version = Elements.VERSION)
public class Elements {
	public static final String MODID = "elements";
	public static final String NAME = "Elements";
	public static final String DESCRIPTION = "The elements and chemical mod.";
	public static final String VERSION = "0.2.0";	
	
	public static Block hydrogen = new Block(Material.ROCK),
			            helium = new Block(Material.ROCK);
	public static ItemBlock ihydrogen = new ItemBlock(hydrogen),
							ihelium = new ItemBlock(helium);
	
	@SubscribeEvent
	public static void registerBlocks(RegistryEvent.Register<Block> event) {
		event.getRegistry().registerAll(hydrogen, helium);
	}
	@SubscribeEvent
	public static void registerItemBlocks(RegistryEvent.Register<Item> event) {
		event.getRegistry().registerAll(ihydrogen, ihelium);
	}
	@SubscribeEvent
	public static void registerRenders(ModelRegistryEvent event) {
		registerRender(ihydrogen);
		registerRender(ihelium);
	}
	@SubscribeEvent
	public static void registerRender(Item itemEvent) {
		ModelLoader.setCustomModelResourceLocation(itemEvent, 0, new ModelResourceLocation( itemEvent.getRegistryName(), null)); 
	}
	

	@EventHandler
    public static void preInit(FMLPreInitializationEvent event) {
		//
    }
    @EventHandler
    public static void init(FMLInitializationEvent event) {
    	hydrogen.setUnlocalizedName("hydrogen");
    	hydrogen.setRegistryName("hydrogen");
    	hydrogen.setCreativeTab(CreativeTabs.MISC);
    	hydrogen.setHardness((float) 0.1);
    	ihydrogen.setRegistryName("hydrogen");
    	ihydrogen.setUnlocalizedName("hydrogen");
    	helium.setUnlocalizedName("helium");
    	helium.setRegistryName("helium");
    	helium.setCreativeTab(CreativeTabs.MISC);
    	helium.setHardness((float) 0.1);
    	ihelium.setRegistryName("helium");
    	ihelium.setUnlocalizedName("helium");
    }
	
}