We're a staffing company, and are in a situation in NC where we're considering filing a lien on a project, and are now realizing that we originally sent our prelim notice to an address that is incorrect. Our customer gave us the address of a parking lot, which is where the employees met up for work, but the work was done at a different location down the street. Is our prelim invalid, and therefore we have no lien rights? What recourse do we have?