Media mogul Oprah Winfrey has suffered another embarrassing setback - the author of a children's book she recommended on her website has been exposed as a white supremacist. Just weeks after Winfrey was forced to fly to South Africa to address reports a matron at the girls' school had been accused of molesting and assaulting pupils, the talk show is in the headlines for all the wrong reasons again. Winfrey has pulled Forrest Carter's children's book The Education Of Little Tree from a list of recommended titles on her website, blaming an "error" for including the work of a hardcore racist. The Education Of Little Tree was described as the real-life story of an orphaned boy raised by his Cherokee grandparents, when it was first published in the mid-1970s. But the award-winning book was caught up in controversy in the early 1990s when the late author, Carter, was exposed as a leading member of American white supremacist group the Ku Klux Klan. Winfrey has since removed the book from her recommendations.