This Article shall be liberally construed to the end that its purposes may be effected. No error, irregularity, informality, and no neglect or omission of any officer of the City and County, in any procedure taken as in this Article provided, shall void or invalidate such proceeding or any assessment for the cost of work done as in this Article provided. The exclusive remedy of any person affected or aggrieved thereby shall be by appeal to the Supervisors as provided in this Article.