2 small things:
first, I can just delete the "gameRegistry.regsiter(item)"?
and second, what I need to type in the (block1, block2...)
I tried to type there (Platinum_Ingot); because I added an item with that name:
public static Item Platinum_Ingot;
sorry about my questions, I'm realy noob and don't know what to do. thanks for all of your help.