Cannot select database
The database server could be connected to (which means your username and password is okay) but the if0_43050641_wp845 database could not be selected.
Are you sure it exists?
Does the user 43050641_2 have permission to use the if0_43050641_wp845 database?
On some systems the name of your database is prefixed with your username, so it would be like username_if0_43050641_wp845. 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.
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There have been a number of reports concerning databases that are missing, notably WordPress databases created with Softaculous. I don’t know what happened to them yet, but clearly something has happened, so I’ve submitted a request upstream to look into it.
I’m experiencing the same issue with my WordPress site. My database also disappeared after being created through Softaculous, and I started getting a database connection error.
Hopefully the upstream investigation helps resolve this soon.