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.

Source: Section 1578, https://leginfo.­legislature.­ca.­gov/faces/codes_displaySection.­xhtml?lawCode=CIV§ionNum=1578.­ (accessed Sep. 22, 2025).

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Verified:
Sep. 22, 2025

§ 1578's source at ca​.gov