Or is it some kind of problem that arose even at the stage of construction or repair. I can't figure out how to properly describe it. In short, if you really don't have any debts, and you are 100% sure of this, then you need a lien waiver form. I advise this site https://www.lienwaiverform.net/lien-waiver-form-in-missouri/, there is a template for this form, and more information that will help you figure it out, and the opportunity to consult with a lawyer.