Two problems with the Association Rules widget

I am using the heart disease prediction dataset from UCI but analyzing it with association rules. The target class is set as "diameter narrowing" which means the presence or absence of coronary artery disease. I first used the discretize widget (set on equal width) which is connected to the Association Rules widget. When I open the widget the check box "Induce only classification rules" is not highlighted so it can’t be selected. Also, when I attempt to use filter by antecedent or filter by consequent (example = diameter narrowing=1) I get no matches. I tried it with multiple different combinations of minimum support and confidence