If you didn’t get notified on the other thread, check out my reply to you there:
Make sure you know which base you need to apply to those memories first before acquiring or crafting one, from my post above.
The umbrahide set is for leather wearers and, as a hunter, you would need an item from the boneshatter set (or grim-veiled cape, if using it on the back, or shadowghast set for ring and necklace). Although you technically can equip leather and cloth items, you need the base to be your main armor type to be able to craft it.
Since you are a hunter, in retail WoW, you will always wear mail as your armor type. So you need to purchase the boneshatter chest piece (not umbrahide leather) or it will not recognize it at the runecarver.