Houston, we have a problem! Database User must be the same?

Houston, we have a problem!
Looks like you need to create your new db's! If you're lucky, this link still works - click me (This link doesn´t work - 404)
Database Error: Access denied for user 'xxxxxxxxxxxx'@'localhost' to database 'xxxxxxxxxxxx_d3'
This d3 database exists and seems be normal, passoword is set also...