Error while trying to activate plugin

hi, i installed this plugin in a multisite, when i tried to actvate it for the network, i got a fatal error saying the following message: "Warning: require_once(/home/...../public_html/wp-content/db-config.php) [function.require-once]: failed to open stream: No such file or directory in /home/..../public_html/wp-content/plugins/multi-db/db.php on line 140"

can i fix it?