Mo. Rev. Stat. § 245.065
If it is made to appear to the judge of the circuit court organizing the district, either in term time or vacation, by an application in writing made by any person or persons interested, that any meeting of landowners for the election of the board of supervisors or any member thereof, held under section 245.060, was improperly called or that the notice thereof improperly or insufficiently stated the time and place of such meeting, or that such notice was not published for the proper time or in the proper manner or was for any other reason insufficient, the circuit judge shall order the clerk of the court in which the district was organized to notify by summons the supervisor or supervisors to be affected thereby, setting forth a copy of the application filed and requiring such member or members to appear before the court at a time and place therein specified, which time shall be not less than five days from the receipt of said notice, and show cause why, if any there be, said office or offices shall not be declared vacant. If it appear to the court at the hearing of the objection or complaint that the said notice of landowners' meeting and election was for any reason insufficient, the court shall declare said office or offices vacant and he shall direct the clerk of the court organizing the district to call a meeting of the property owners for the purpose of electing other supervisors to fill the vacancy or vacancies, and thereupon it shall be the duty of the said clerk to call and give notice of such new meeting, in the manner and for the time specified in section 245.060. The meeting of the property owners and the election of the supervisor or supervisors shall be conducted, in all particulars, as prescribed in section 245.060, and the supervisor or supervisors thus elected shall supersede the member or members previously elected, and upon qualifying as provided in sections 245.070 and 245.075, such supervisors shall thereupon become the true corporate authorities of the district for the unexpired term or terms of the de facto supervisor or supervisors whose offices have been vacated as herein provided; provided, that where such vacancy shall occur because of the insufficiency of notice of the annual landowners' meeting held under the provisions of section 245.070, the remaining qualified supervisors shall fill such vacancy by appointment, such appointed supervisor to hold office only until the next regular annual landowners' meeting, at which time a new supervisor shall be elected to fill out the remaining unexpired term.
§ 245.065, RSMo