The quest immediately before that one rewarded you 2 ancient iron coins. Unless you have 2 or more of these type of coins in your inventory you cannot accept this quest. So if you sold them you will need to obtain 2 more from other quests or as mob drops before you pick the quest up again.
Greetings @ZeroLife, I am sorry to hear you had some troubles with your main quest, but I can see your fellow adventurer @Gharlane was able to guide you successfully through this problem and you have now been able to proceed with your quest further! Thank you @Gharlane for stepping up to help out, it really warms my hear to see players taking care of each other =)!