Hello,
The error message is hard to read from your screenshot but it looks like the error is
"Number of cultures on the site does not fulfill license requirements".
This error message means, you have more cultures on the site, then the license supports. A free license supports only one language. Languages can be added/removed in
CMS SiteManager / Sites / <your site>/ Cultures. Can you please make sure the site you are exporting only has one Culture selected.
Best Regards,
Edward Hillard.