California Code, Civil Code - CIV § 5950

(a) At the time of commencement of an enforcement action, the party commencing the action shall file with the initial pleading a certificate stating that one or more of the following conditions are satisfied:

(b) Failure to file a certificate pursuant to subdivision (a) is grounds for a demurrer or a motion to strike unless the court finds that dismissal of the action for failure to comply with this article would result in substantial prejudice to one of the parties.