Hi,
I got this also on a fresh appliance installation at customer site.
- creating a site on the command line of the appliance works without any error message. But the site management also wants to migrate it.
- starting the site (via web or cmdline) works and the button “migrate data” disappears during the site is running. Once stopped, the migration for a site is again suggested.
=> Tribes, it would be great to know what is happening here. Even if the site after the “migration” (?) works, it’s not trustworthy at all to get error messages … 
Thanks,
Simon