164

No action or proceeding to set aside, vacate, cancel or annul any assessment or tax for a local improvement shall be maintained, except for total want of jurisdiction to levy and assess the same on the part of the officers, board or body authorized by law to make such levy or assessment or to order the improvement on account of which the levy or assessment was made. No action or proceeding shall be maintained to modify or reduce any such assessment or tax except for fraud or substantial error by reason of which the amount of such tax or assessment is in excess of the amount which should have been lawfully levied or assessed.