We have a job where we provided a one-time order on December 10th. Based on my understanding of the lien law, our deadline to file the lien would be March 10th. The Notice of Nonpayment would normally be due by the end of March (90 days from the last day of Material supplied). Does that mean we must send a notice of nonpayment to the owner before we file the lien, or is it OK to file the lien prior to sending out the notice, but we must notice the job at the end of March? What happens if we file the lien, but don't send out the Notice of nonpayment? Does that invalidate our lien?