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Error: java.lang.NullPointerException: Rendering item


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It looks like you cut and pasted fragments of your Item initialisation and recipe code, but I'm guessing you haven't initialised the item properly by the time you create the recipe.  Your recipe then contains an ItemStack with a null Item, so when you first use it (the crafting tries to render it) tries to use the null item reference and crashes.


Use preInit for items and postInit for recipes.  See here for more background information.





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