An '''Invincible error''' is, in [[Christianity|Christian]] [[philosophy]], a normally [[sin|sinful action]] which is not considered sinful because it was committed through blameless ignorance that one's actions were harmful or otherwise prohibited.<ref>[http://www.newadvent.org/cathen/05525a.htm 'Error' in Catholic Encylopedia]</ref>
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In the stated philosophy, a sin occurs when a person knowingly commits an evil act, meaning that they must know both:
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*that they are committing the act
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*that the act is evil
If a person is ignorant of one of these two facts, then the type of ignorance becomes important. If the person is intentionally or willfully ignorant, this is known as ''vincible'' ignorance, and the act is still considered a sin. If, however, the person is unintentionally ignorant of one of these two key facts, then they are considered ''invincibly'' ignorant, and have committed an invincible error.<ref>[http://www.katapi.org.uk/MoralTH/ChV.htm Elements of Moral Theology]</ref>
