Hi there,
as you mentioned, you're using a hosted web space so most probably there exists Web-GUI to manage services like MySQL. In the previous steps installer asked root user credentials for the MySQL database in order to create dedicated i-doit CMDB user.
If you have a possibility to maintain your database users over Web-GUI, try to create dedicated i-doit CMDB user manually and start your installation from the beginning.
Cheers,
Chekov