I am a real estate broker qualified to advise you on California real estate matters, not the law. If you desire legal advice, consult with an attorney.
Are you working with a Realtor? What does your Realtor say? If your agent doesn't know the answer, talk to their broker.
Did you use C.A.R. forms? If so, unless otherwise added, there are exactly ten reasons why a seller may cancel. Having a lien against your property is not listed as one of them. The C.A.R. purchase agreement also says the Seller is obligated to payoff monetary liens of record. Best of luck to you!