Contract Project Manager Payment for Services Not paid

Hi, I'm owed payment for services as a contract Project Manager on 2 jobs; 1 in Watertown, and one in Brookline. The owner of the GC I was contracted by created an impossible scenario to deliver the job on-time, or in the clients expectations, so I quit. The GC (my boss) claims he doesn't owe me the payment for the 2 weeks. Is it possible for me to lien the jobs? The C of O's haven't been approved yet.