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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.