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Kindly note that it is related to Elsa's quest, "The Ice Cavern Mystery".
Please complete the quest by obtaining a Gold Ingot.
Please note that not only can you craft a Gold Ingot, but you might even get one when feeding ravens their favorite food in the Forgotten Lands. You can also occasionally find a Gold Ingot available for purchase at Kristoff's Stall.
After completing Elsa's quest, the Crafting menu should become available again.