In chapter five of Harry Potter and The Goblet of Fire, Harry meets two of the Weasley brothers whom he never met before, Charlie and Bill.
Harry looked around and saw that Ron and George were sitting at the scrubbed wooden table with two red-haired people Harry had never seen before, though he knew immediately who they must be: Bill and Charlie, the two eldest Weasley brothers.
But hadn't Harry already met Charlie before while giving away the dragon baby which Hagrid won in cards. Is this a continuity error?