Multi-Domains doen't work - why?

Has Multi-Domains and Domain Mapping (and WHMCS Provisioning but it is not important I think).

Followed by instructions of Multi-Domains but it doesn't work: I created a test site from wp-admin and got an error (watch screenshots).

Tell me pls - what's wrong?

P.S.- the domain has such DNS: ns1.mysite.ru ns2.mysite.ru.