Due to his busy schedule, actor Joseph Gordon-Levitt had to apologize for the part offered to him by director Quentin Tarantino in the new film "Django Unchained".Joseph is currently filming "Lincolin" with Steven Spielberg, the new sci-fi "Looper", "The Dark Knight Rises" and "Premium Rush" which made it very difficult for him to accept the role in Tarantino's film even though it is not a big part but it requires traveling to the American West and stay there for weeks. In his interview with MTV, Joseph said: "Tarantino is one of his favorite directors and I've always hoped to work with, but when I spoke to him about my busy schedule he understood and wished me luck"."Django Unchained" stars Leonardo DiCaprio, Jimmy Fox, Samuel L. Jackson, Christoph Waltz, Kerry Washington and Kurt Russell and is set to be released on 25 December 2012.