How do I check for data selected in an items array on an interface?

I have a an editable grid in my interface.  In one of the columns, when I select "return to customer" I want a paragraph field to display.  I'm using the following code and I'm getting the following error on the task in tempo:

Code:

if(contains(ri!itemsRoles.disposition, "Return to Customer"),
          a!paragraphField(
            label: "Comments - Additonal Information Needed",
            labelPosition: "ABOVE",
            instructions: "Enter the reason for returning this request to the requestor",
            value: ri!rtcReasonISS,
            saveInto: ri!rtcReasonISS,
            refreshAfter: "UNFOCUS",
            required: false,
            height: "MEDIUM",
            validations: {}),
            {})

Error: