Good morning! I jumped into your account along with the most recent mailing and I definitely see the whoops error you're running into. It came up almost immediately for me. It looks to be something up with the template code itself because if I create a new mailing with the OK 22 template with no content, the error comes up as well. Young Life handles all of their own template design, so you'll want to reach out to them directly and they should be able to get that fixed up. Please let me know if you need the contact info for their corporate office.