London, April 14: Amazon. com has apologised for an error due to which the sales ranking were removed from tens of thousands of books, and it became difficult to search for tomes.
Making a statement on Sunday, the online retailer said that a "glitch" had caused the problem, and promised that the numbers would be restored.
However, sales numbers were still missing until Monday afternoon.
Hit by the error were recent works like Chelsea Handler''s My Horizontal Life, as well as classics like Gore Vidal''s The City And The Pillar and James Baldwin''s Giovanni''s Room.