Error saving website settings after setting custom domain

The attachment shows the error.

Yes, I did read this.
support.toastmastersclubs.org/doc/item/dns-settings-overview

I've successfully switched our website to the vaportrailstm.com domain. It is all working, but I just wanted to show the error that I received initially. Someone might want to look into that and fix it as it is a confusing part of the process. Fortunately, it still worked for me.

For the mx record on godaddy.com I used 10 for priority, @ for the host, and mail.vaportrailstm.com for the points to fields.

Vapor Trails Toastmasters
Club 203

That error happens when you don't have the latest code saved in your browser. Click the reload link at the bottom of your site fixes it most times.