Within 90 days after the order declaring the result of such election has been entered, the Board of Directors shall cause a certified copy of such order to be filed in the office of the county clerk of each county in which the District is situated and in the office of the Secretary of State, and the Secretary of State shall thereupon issue a certificate of incorporation to such District, which certificate of incorporation shall be recorded in the office of the recorder of the county in which the proceedings were had. Such requirements of filing and recording are directory, and failure to file within apt time shall not vitiate such organization.
70 ILCS 910/9