Visit /wp-admin/upgrade.php
on each site to manually upgrade the database e.g.
http://www.example.com/wp-admin/upgrade.php
This happens if you have a site on the WordPress network that doesn’t resolve or if you have spoofed DNS locally but not on the server – your computer knows that www.example.com points at 127.0.0.1 but your local server is still resolving www.example.com to its actual address when PHP does its CURL call.
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