Access denied for user 'marie1303286_1kuw1n'@'%' to database 'marie1303286_1kuw1n'

Cannot select database

The database server could be connected to (which means your username and password is okay) but the marie1303286_1kuw1n database could not be selected.

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.