Directory using Contact 7

Someone who previously supported our page created this form to allow our members to contact other members, but not show the email on the website. This has been working for years, but recently I got a Configuration error. The user is shown a list of members in a Directory field, and then the word directory is used in the email tab for the To: – this is where it is saying directory is not a valid field. I’m not sure how to get the field updated to remove the error, and currently I get an email delivery error when I try to use the form

The page I need help with: [log in to see the link]