The exception is being thrown from the ItemStack constructor on line 82 of ItemStack, which is being called from line 250 of Main.
If you look at line 82 of ItemStack, you'll see that the only object that has a field or method accessed is the Item argument. This means that you passed null as the first argument of the constructor. Line 250 of Main is this:
GameRegistry.addRecipe(new ItemStack(MyChest_1, 1), new Object
Therefore MyChest_1 is null. This is because you haven't initialised it.
Please don't PM me to ask for help or to join your mod development team. Asking your question in a public thread preserves it for people who are having the same problem in the future. I'm not interested in developing mods with people.