[Events +] Events+ Integration

Hello, I'm having some issues getting Events+ working. I've opened up the site for WPMUDEV Admin and included a screenshot of the error message and the app set up from Facebook here on my google drive: https://drive.google.com/open?id=19vdlAY3jK1J2HCLBuK-GT_zkl44LAipH
I can confirm that I have been given admininstrator access to the Facebook Page: https://www.facebook.com/crafts2enjoy/