Unable to Use Shield Lob

My character is Kaori Aki on Cactuar, and for some reason I'm unable to use Shield Lob at all. It is constantly greyed out and gives me an error "Cannot use yet." I have completed the lvl 15 quest, and have the ability in my Actions & Traits menu. I tried using the in-game support a few days ago, but I haven't received a response, so I figured I would post here too.

http://puu.sh/eAjgV/1a0d25e846.jpg

http://puu.sh/eAiBr/1e1f391a2c.jpg

http://puu.sh/eAiKv/9d82c35a05.jpg

Do you have a shield equipped?

Edit: According to your lodestone profile, you don't.

So, equip a shield. :)

Ah, okay. Thank you for the response. Guess it would make sense that you have to have a shield equipped to use Shield Lob.