Civil Code section 1578


Mistake of law constitutes a mistake, within the meaning of this Article, only when it arises from:
1.A misapprehension of the law by all parties, all supposing that they knew and understood it, and all making substantially the same mistake as to the law; or,
2.A misapprehension of the law by one party, of which the others are aware at the time of contracting, but which they do not rectify.
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Verified:
Jun. 25, 2025

§ 1578's source at ca​.gov