hello community

i always loved to be the healer, so i want to become a whitemage so bad.
but its not that eay as i thought: i just cant start the quest.
i got my con and my arc lvled (con 30 arc 16) but this guy still says that my arc isnt lv 15 yet. i did all the quests on my arc and my con too :/ i just dont know what to do