California · Civil Code
CIV §1578: Mistake of law constitutes a mistake, within the meaning of this Article, only when it arises from: 1.
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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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