(b) The publication authorized by this subdivision shall be in the state register and in the official newspaper or newspapers of the city.
(c) After the expiration of the sixty day period set forth in such notice the validity of such agreement shall be conclusively presumed and the validity thereof shall not thereafter be questioned by either a party plaintiff or a party defendant and no court shall have jurisdiction in any action, suit or proceeding contesting such validity.
(d) Neither any error or omission in the notice of publication provided for in this subdivision shall affect or impair the validity of an agreement executed pursuant to this section so long as the notice substantially conforms to the provisions of this section.