Multi-DB database names

When I follow the instructions for the multi-DB plugin I get an error in the Mysqladmin panel -#1102 - Incorrect database name 'xxxxxx.com_xxxxxx0100'
Using the "Incsub DB Tools" page I noticed that the first entry was 100. The database name I used was xxxxxx01.
Am I correct in assuming that the 01 is causing my "#1102 - Incorrect database name" error?
Do I have to start from scratch on my DB or is there a way of renaming or recreating it so that it works?
Thanks,
Rich