report a BUG, pls help !

[forwow]

dear sir:
my problem is : I've got all the pages needed in my bag but i just can't hand in the quest The Green Hills of Stranglethorn :chapter 1 .
My quest log displays that i've complete the quest,but i can't click the "go on" button when i'm talking with the NPC, here are some screenshots ,pls help me ,thx.

[Pottu]

Abandon the quest and retake it. Alternatively, delete your WBD folder and try again. Both of these force the client to recheck quest items in your inventory and should fix it.

The GM team.