No informality in any proceeding not substantially affecting adversely the legal rights of any person shall invalidate the incorporation of any district.
All proceedings to contest the validity of the incorporation of any district may only be commenced within three months from the date of the issuance of the certificate of incorporation. If no such proceedings are commenced within the time allowed, the incorporation of the district, and all proceedings in connection therewith, shall be valid and incontestable.
(Added by Stats. 1943, Ch. 286.)