Harry Potter movie makers fear the next installment of the fantasy franchise will flop - because J.K. Rowling has released the last novel in the series.The first five films were a huge box office success, cashing in on the hype surrounding the publication of Rowling's books.But the seventh and final text was in bookshops last year - and there are still three movies yet to hit theatres.The film adaptation of Harry Potter and the Half-Blood Prince is set for release next year, while the final book - Harry Potter and the Deathly Hallows - will be split into two pictures.And screenwriter Steve Kloves admits to Entertainment Weekly, "I'm not going to lie to you. I do have some concern that because the books are over, the anticipation won't be the same."It would be a complete car crash if no one showed up."

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