Section 1578.
Cal. Civil Code - CIV § 1578.
in effectMistake 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: CA Legislative Counsel Bulk DataURL: https://downloads.leginfo.legislature.ca.gov/pubinfo_2025.zipFetched: 6/27/2026