In 2003, Gurewitz was recruited by 12 Rounds member and Nine Inch Nails collaborator Atticus Ross and his younger brother Leopold to play guitar and bass in an electro-hardcore project called Error. Their only release to date is a self-titled EP, which was in 2004. Following the release of the EP, Error was reported to be looking for a full-time vocalist for touring and a full-length debut; however, the future of the project has been a topic for discussion on many internet message boards. In 2005, Error recorded one new song, "Wild World", that appears on a tribute album to The Birthday Party called Release the Bats: The Birthday Party as Heard Through the Meat Grinder of Three One G, which was released on April 4, 2006. Error has been on hiatus since and it is unclear whether the project will return anytime in the future.
