If you need support from Yola please contact us via firstname.lastname@example.org or make use of our live chat service! We are working on a new approach to community-based support and during this transition period we are not adding any new threads to this forum. Many thanks to everyone who has participated over the years and we look forward to unveiling a new peer-to-peer support system soon!
You would get that error if you are editing the site in two tabs or windows at once. You should select whichever option you think is correct. So if the page you are currently editing is the one you want to keep, click "use current version" If you are unsure, click "save your page as" and then you will have a copy and you can check which one is right.
The system is working as it should to avoid an error if you see that dialog so there is nothing to worry about.