The database server could be connected to (which means your username and password is okay) but the ct_vega_rmwrt database could not be selected.
ct_vega_rmwrt have permission to use the ct_vega_rmwrt database?username_ct_vega_rmwrt. 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.