Fatal error: Call to undefined function add_dc_ip() in /home/trucke7/public_html/truckerinfo.eu/wp-c

Fatal error: Call to undefined function add_dc_ip() in /home/trucke7/public_html/truckerinfo.eu/wp-content/plugins/multi-db/db-config.php on line 16

In multi db I get this msg when i go to active the plug-in. I did all the steps and move the db. with no problems. I tried put in in the shared server ip. and even localhost. on line 16 of the db-config.