The database server could be connected to (which means your username and password is okay) but the demoprow_reporting_addon
database could not be selected.
demoprow_prouser
have permission to use the demoprow_reporting_addon
database?username_demoprow_reporting_addon
. Could that be the problem?If you do not know how to set up a database you should contact your host. If all else fails you may find help at the WordPress Support Forums.