Activation of Multi-DB cause Fatal error...

Hello Vaughan,
Appreciate much your prompt reply. YES you are right, didn't move the file... but now it's done and, perhaps you've an additional advice for the following 'next' failure while activating Multi-DB.

Fatal error: Call to a member function get_row() on a non-object in /home2/bestofv2/public_html/wp-includes/option.php on line 982

How do I forward to you a screen capture as attachment?
Yes I login as a super-admin actually which is required in order to setup our sites.

Thanks again
Kind regards