ATLANTA (AP) — A longtime aide to Jimmy Carter has resigned from the Carter Center think tank, calling the former president’s new book on Israel and the Arabs one-sided and filled with errors.

Kenneth Stein, the Carter Center’s first executive director and founder of its Middle East program, sent a letter that bluntly criticized the book to Carter and others.

Stein wrote that the book, “Palestine: Peace, Not Apartheid,” was replete with factual errors, material copied from other sources and “simply invented segments,” according to an excerpt of the letter published by the Atlanta Journal-Constitution.

Deanna Congileo, Carter’s spokeswoman, said the former president stands by the book.

Stein, who is also director of the Institute for the Study of Modern Israel at Emory University, did not immediately return a call Wednesday.

Carter issued a brief statement saying that Stein had not been actively involved with the center for more than 12 years and was not involved with the new book. Carter did not directly address Stein’s allegations.

Kenneth Stein had a fatwa placed on him by al-Carter. Disagreement in the ranks is intolerable.