Neb. Rev. Stat. § 13-313: Neb. Rev. Stat. § 13-313

The failure of any county clerk, city clerk, clerk of a political subdivision, except any city of the metropolitan class, or any other person upon whom the duty is imposed by law to mail a copy of a published notice as provided in sections 13-310 to 13-314 shall invalidate the assessment against the property involved while permitting all other assessments and procedures to be lawful.