Warning Message When Updating new wordpress page

I produced a new web page on my development site and then exported - imported to the actual site - scandinavia.contractoreurope.com. When I save draft or update the page on the new site I get the messages shown in the screenshot attached. Can you help me solve this issue please. I have just started a 30 day trial and have used Hummingbird Pro and Smush Pro to optimise the existing pages on the site before I imported the new page. I am using Divi Theme.