Error establishing a database connection

Hello, Could someone help me please? This is the error I get after I used acronis backup to roll back a day.

<span style=”color: rgb(68, 68, 68); font-size: 14px; white-space: normal; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;”>The database server could be connected to (which means your username and password is okay) but the?</span><code style=”font-size: 14px; white-space: normal; font-family: Consolas, Monaco, monospace;”>nauseent_nauseentaher.com<span style=”color: rgb(68, 68, 68); font-size: 14px; white-space: normal; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;”>?database could not be selected.</span>

• Are you sure it exists?Does the user?<code style=”font-family: Consolas, Monaco, monospace;”>nauseent_nauseentaher?have permission to use the?<code style=”font-family: Consolas, Monaco, monospace;”>nauseent_nauseentaher.com?database?On some systems the name of your database is prefixed with your username, so it would be like?<code style=”font-family: Consolas, Monaco, monospace;”>username_nauseent_nauseentaher.com. Could that be the problem?

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