(1) Errors of description of the intermediate points, courses or distances of the exterior boundaries of the proposed district set out in the petition for organization or as changed at the hearing by the county board, when the exterior boundaries can be otherwise definitely determined.
(2) Errors in posting notices where it can be shown that all persons objecting to the proceedings had actual notice thereof prior to the hearing.
(3) Errors in or omissions of the names of petitioners or number thereof, or in the percentage thereof of property owners in the district, required to sign the petition for organization, where there is entered upon the records of the county board an order or proclamation establishing or legally forming such district. [Amended by 1969 c.667 §10; 1975 c.326 §4]