Error trying to load smf 2.0.15

[xtian]

Trying to install SMF but get this message. I have setup the database and user on the server.
The domain help tells me that SMF does not support MariaDB which is what they are using but I have another website with them running SMF fine?

What am I missing here

[Arantor]

Their PHP setup doesn't have the PHP-MySQL connector set up properly, ask then to install mysqli.