In no case shall any error made by the Collector or any deputy of the Collector in preparing a registration certificate, stating the amount of the tax thereof, or determining the proper zone, prejudice the collection by the City of the amount actually due under this title for the carrying on of any business, trade, occupation, nor shall the issuance of a registration certificate by the Collector or said deputy authorize the carrying on of any business, trade or occupation in any zone or location contrary to the provisions of the zoning ordinance of the City now in effect or which may hereafter be adopted. (Ord. 2062 § 2 (part), 1975).