Alaric not want to trade (Dragon Age: Origins)

Play the city elf rogue just passed the quest Unrest in Alpinae and Alaric still don't want to trade, says: do not Even know how to understand what Aventicum did not have enough money so you sold us all this time, come here While I killed Caladrius and saved all the elves, and I need a book Killer he has to buy because Zevran I killed. Tell me when it will trade and whether?