Multi-DB Installation Error


i installed multi-db on my WPMU @ and i got this error after i completed the installation process.

"The blog you have requested is not installed properly. Please contact the system administrator."

what i did is the following:
1. placed the files as instructed in install.txt
2. created all required DBs
3. configured the db-config.php

and finally i get the error shown above,

anyone can help please, i wasted over 6 hours just trying to make it work!!!