If you receive the error message “Unable to create a database Check that your hosting account has at least one database available” when installing an application, you most likely have used all of your databases. The installation program automatically creates the database if there is at least one available. Most of the applications requires a database. The amount of databases in each web hosting plan is limited. You can compare web hosting plans here.
To fix this issue, you can delete a unused database, order a database as an add-on or upgrade your web hosting plan.