Unable to buy northern spices?

Since, the patch I haven't been able to purchase Northern spices with dalaran cooking awards from the cooking vendor. This is an in game issue. I don't have any other issues. I check almost everyday when i log same problem "Internal Bag Error" I try over and over again. I have tried on three different toons and none will allow me to purchase them. Internal Bag Error every time, so basically I have to purchase them from the auction house, or do the daily cooking quest to get northern spices.

I'm sure this has been mentioned before, any ETA on when this problem will be resolved it's getting expensive to continue to purchase Northern spices for food buffs.