91. No suit shall be instituted against the Authority or Chairman, or any member, or any employee of the Authority or any person acting under the direction of the Authority, or of the Chairman or of any employee of the Authority in respect of any act purporting to be done under this Ordinance or any rule made hereunder, until the expiration of one month next after written notice has been delivered or left at the Authority's office or the place of abode of such employee or person, stating the cause of action, the name and place of abode of the intending plaintiff, and the relief which he claims; and the plaint must contain a statement that such notice has been so delivered or left.