 This error theory thesis has to be massaged a little to be even consistent. After doing some of the needed massaging, we’ll examine Mackie’s argument and the debate it spawned. Many of the arguments are on their faces specific to the moral domain, but applicable to normativity in general on further reflection. Many of the earlier error theorists applied their views only to the moral (Mackie 1977; Joyce 2001), while more recently, some have argued for an error theory about the normative in general (Streumer 2017). Since our concern here is with the normative, we’ll address that broader domain, except where an argument only applies to the moral, or where we are trying to be accurate to an historical argument (e.g., Mackie’s).