No WPMU site defined on this host

I load all the Files of the Multi database plugin

all are in the right Directories as per instructions, checked many times

across to my server every thing is fine until i put across the db.php file

and I get this

No WPMU site defined on this host. If you are the owner of this site, please check Debugging WPMU for further assistance.

here is my db-config file

which is in /wp-content/ as is db.php

list-hashes.php and move-blogs.php are in wp-content/scripts/

server-ip.php is in wp-content/mu-plugins/multi-db-2.6.0/

am i meant to be configuring db.php ? and what about server-ip.php ?

I have configured the move-blogs.php and am confident all is well there

anyway its not untill I put the database db.php accross that I get the error

Any Ideas can someone look at my db-config.php please

I have to go to Bed Yawwwn

Regards Bill