Ther'es one in this clue (4)
(Other definitions for typo that I've seen before include "Character flaw" , "Thanks; good health!" , "Literal - printing mistake" , "Printer's mistake" , "Printer's error" .)
(Other definitions for error that I've seen before include "Faulty judgment" , "A mistake or inaccuracy" , "Miscarriage of justice" , "Way of operating" , "wrongdoing" .)