get a copy of the court order that gives you the visits. go to the next visit. if it is refused, call the police and ask that he be arrested for visit interference. you should have a copy of the state statute on that with you. i will get the link and post it.
do not be surprised if the police do nothing and tell you it is a civil matter, go see a lawyer. then do a petition for visit abuse under 750 ilcs 5.607.1. ask the judge why no rule to show cause is issued? be polite.
I agree with the responses below. You need to document everything and make sure you have your certified copy of the court's order granting you the supervised visitation. You also need to make sure you are following all the "rules" for your supervised visitation. Is there language in the order about a basis for him to deny the visits? For example, in some cases, an order might say a parent can deny the visitation if they suspect the other parent is under the influence of drugs or alcohol. You should make a record of the denied visits by contacting and making a police report.
Any answer I provide to individual's questions are based upon general knowledge and do not create an attorney-client relationship. There is not enough information provided to give a full and complete legal response and you must meet with me or another attorney directly in order to discuss the details of your entire case.