If you ever error (29) just take off an item, Update gear set, Put item back on, Update gear set, Portrait button, Find Job, Edit, Save.

Also, I noticed that upgrading the 610 crafted weapon to 620 bugged hard because they have the "same apperance" but not the "same item" so the game kept flagging that as being a problem. I just did the above by saving the 560 Job weapon (since I had it on me still), saved, put the 620 on, saved, etc.