Switching gears sets "gear not found"

[Niwashi]

Is it the way i am converting items into materia?
I take them off and put them into armory then convert.
I also make sure i have an item ready to replace it in my inventory and replace it from there.

Be sure to equip the new item and update the gear set (triangle on PS3, I think it's a button to click on PC) before converting the old item. Also, make sure you do that update on all gear sets that use the item. (This is the part that usually catches me.) For your leatherworker belt example, do you have other crafting classes that may have been using the same belt? Perhaps you updated one of them and then converted the old belt, without realizing the leatherworker set was using it as well.

Before getting rid of an old item, make sure it's no longer used in any of your gear sets. Any item that's part of a gear set will have a little page symbol in the lower right corner of its icon. Be sure there's no such symbol on it before converting, removing, or selling gear.

[Kmt]

Thank you so so much.Yes now it all makes sense.I finally understand what i am doing wrong. Niwashi my thanks to you again and to everyone that has helped me through this.