DeadLeopard

Then, what should I do?

Thanks

package com.deadleopard.alumcraftmod.init; import java.util.ArrayList; import java.util.List; import com.deadleopard.alumcraftmod.items.ItemBase; import net.minecraft.item.Item; public class ModItems { public static final List<Item> ITEMS = new ArrayList<Item>(); public static final Item COPPER_INGOT = new ItemBase("copper_ingot"); } This is what I've got in ModItems

1.I'm learning java right now 2.The screenshot with the registry code

I've been making a minecraft 1.12.2 mod using eclipse, but now I can't run minecraft to test it. This is the full text displayed in the console: I'm still learning to use java, so I don't know what this things could mean. Anything would be helpful (Also sorry for the bad english)