I wrote that off the top of my head having some knowledge of contract law. Since you said it was in error I looked it up.
A non binding contract is an agreement in which the parties are not legally obligated to carry out its terms. Their purpose is to state the parties' intention as part of the negotiation process. If both parties agree to the terms of the non-binding contract, they can sign a binding contract afterward. There are also other situations in which a contract may be non-binding.