§ 21-a. Vacating lien for a public improvement, by order of court. A lien against the amount due or to become due a contractor from the state or a public corporation, for the construction or demolition of a public improvement, may be vacated and canceled by an order of the supreme court. Before such order shall be granted, a notice shall be served upon the lienor personally or, in such manner as the court may direct. Such notice shall require the lienor to commence an action to enforce the lien within a time specified in the notice, not less than thirty days from the time of service, or show cause at a special term of the supreme court in the judicial district embracing the county wherein the notice of lien is filed, at a time and place specified therein, why the notice of lien should not be vacated and canceled of record. Proof of such service and that the lienor has not commenced the action to foreclose such a lien, as directed in the notice, shall be made by affidavit, at the time of applying for such order.