You weren't very clear on your exact problem. One possibility that I didn't see mentioned is that you traded the Taru a coin and d/ced or someone warped you in the middle of your conversation with him. If you did then he would not accept a new coin from you until his previous contract is fulfilled. When you get back on try just talking to the NPC without trading him anything. If this is the case just tell him where you wanted to go and he will send you there without taking a new coin and you will be good to go from then on.