The truth is that both spouses have equal rights in a declaration of nullity proceeding, but that doesn't mean that the respondent—the ex-spouse of the person who starts the declaration of nullity process—has to agree to a declaration of nullity. The truth is that the tribunal judges can grant a declaration of nullity even if the ex-spouse is adamantly opposed to the idea. While your former spouse does not have to agree to the declaration of nullity, Church law does require that the former spouse be contacted and informed that you have started the process, and they will be given the opportunity to give testimony and name witnesses. The former spouse does not always exercise this right, but the law requires that they be informed. In the event the address of the spouse is unknown, this should be explained to the priest helping you with the application.