I can't use crafting.

If you are unable to use crafting, please check the following:

If you are unable to craft even though you have the required materials:
• Are the items equipped to a unit in one of your parties?
• Have you registered any of the items you require to your Favorite Equipment?
*Items that apply to either of the above will not be displayed as available materials on the Crafting screen.
• Do you have enough of the necessary items?
• Items are not displayed on the Crafting Screen / Filter is set *If "Filter: ON" is displayed, your items are currently being filtered.
• Are the necessary Crafting Materials in your possession?
*Craftable items will only be displayed when you have at least 1 of the required recipe, item, or equipment.
*Regardless of + notation, some crafting items of the same name require the same recipe. If an item previously available for crafting no longer displays immediately after crafting another item, please check whether or not you currently possess any copies of that recipe. For example, both the Mythril Sword and Mythril Sword +2 require the same Mythril Sword Crafting Recipe.