After the publication of a resolution, summary of such resolution or certificate together with such a notice, the validity of the obligations authorized thereby may be contested only if: 1. Such obligations were authorized for an object or purpose for which the municipality, school district or district corporation is not authorized to expend money, or 2. The provisions of law which should have been complied with at the date of the publication of such resolution, summary of such resolution or certificate were not substantially complied with, and an action, suit or proceeding contesting such validity is commenced within twenty days after such publication, or 3. Such obligations were authorized in violation of the provisions of the constitution.
New York Legal Code