An '''invincible error''' is, in [[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 Encyclopedia]</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>
