MULTI-DB No such file or directory in /homepages/40/d375803721/htdocs/wp-content/plugins/multi-db/d

Hi, I tried activating Multi-DB on my website and it came up with the following warning

Warning: require_once(/homepages/40/d375803721/htdocs/wp-content/db-config.php) [function.require-once]: failed to open stream: No such file or directory in /homepages/40/d375803721/htdocs/wp-content/plugins/multi-db/db.php on line 115

Multi-DB would help me a lot but this problem has bugged me each time I would try to activate it.