Help!!

Hello. I'm a WARLOCK of the aliiance. I could not receive the task of summon Succubus when my level is 40. So I decided to make a new start . But the situation was the same when my level is 26. I went to find the NPC,Gakin the Darkbinder. But I just could not see any tasks. Why? Is is a bug or something? Please help. Thank you !

open a ticket in-game, GM should help this kind of "class issue" as far as I know
BTW be sure to check on google if you are doing it correctly