Hello @nicoledinardo
Hope you are doing well!
I’m sorry to hear you have this issue. Please backup your site before proceeding to the next step. The error is shown means that the site can’t establish a connection with a database or a database might be corrupted. The first step is to check the wp-config.php file
Please let me know, have you edited the wp-config.php file? The Hummingbird doesn’t edit the wp-config.php, where the database name, username, and password are located.
Please have your Database name, database username and database password, edit the wp-config.php file and make sure your login credentials for your database are correct:
/** The name of the database for WordPress */
define('DB_NAME', 'database_name_here');
/** MySQL database username */
define('DB_USER', 'username_here');
/** MySQL database password */
define('DB_PASSWORD', 'password_here');
/** MySQL hostname */
define('DB_HOST', 'localhost');
Please see here for more information:
https://kinsta.com/blog/error-establishing-a-database-connection/
If the above will not resolve this issue, please contact your hosting provider to ask if the server database is down.
Let us know how it went!
Kind regards,
Nastia