tanyakorteling on "[Theme: Travelify] RSS Feed invalid in Mailchimp"

Hi;

I've been trying to set up an RSS feed campaign in mailchimp but it is saying the feed URL is invalid.

I've followed all the help advice given out and it seems that everywhere else the feed is valid:

I've tried the following:

http://www.cantravelwilltravel.com/index.php/feed/

So far I've tried the following to fix it:

1) Deactivating all plugins - this didn't resolve the problem

2) Switched to another theme (Twenty Sixteen theme) - this resolved the problem which leads me to believe it is a theme related issue. I'm using Travelify Child Theme.

Please can someone advise how to fix this?

Thanks
Tanya