Did Harry meet Charlie Weasley before Goblet of Fire?

Question

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?

Answer 1

Charlie didn't come to pick up Norbert

In his response letter to Ron, Charlie says that Norbert will be picked up by some "friends" who are coming to visit him:

I'd be glad to take the Norwegian Ridgeback, but it won't be easy getting him here. I think the best thing will be to send him over with some friends of mine who are coming to visit me next week.

^{Harry Potter and the Philosopher's Stone Chapter 14: "Norbert the Norwegian Ridgeback"}

And when the tradeoff actually takes place, only Charlie's friends are present:

Chuckling about Malfoy, they waited, Norbert thrashing about in his crate. About ten minutes later, four broomsticks came swooping down out of the darkness.

Charlie's friends were a cheery lot.

^{Harry Potter and the Philosopher's Stone Chapter 14: "Norbert the Norwegian Ridgeback"}

So no, Harry and Charlie had never met in person.

Answer 2

Charlie didn't take the dragon, his friends did.

Harry had only sent a letter to Charlie in Romania.

From the letter that Ron sent to Charlie:

I think the best thing will be to send him over with some friends of mine who are coming to visit me next week. ... They can meet you there and take him away while it’s still dark.

And an actual scene:

Charlie’s friends were a cheery lot.

Answer 3

While the other answers are correct that Harry had never met Charlie Weasley before, there's still an argument that a continuity error exists.

The text reads:

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.

While he had never met either of them before, he had seen them in the picture from the Daily Prophet from the Weasley's trip to Egypt in Harry Potter and the Prisoner of Azkaban.

Harry scanned the moving photograph, and a grin spread across his face as he saw all nine of the Weasleys waving furiously at him, standing in front of a large pyramid. Plump little Mrs. Weasley; tall, balding Mr. Weasley; six sons; and one daughter, all (though the black-and-white picture didn’t show it) with flaming-red hair.