Can’t add or remove any databases en plesk

Error: Unable to remove some of the selected databases. The user specified as a definer (‘root’@’localhost’) does not exist

# plesk db
MariaDB [psa]> CREATE USER 'root'@'localhost' IDENTIFIED BY 'password';
MariaDB [psa]> GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost';
MariaDB [psa]> FLUSH PRIVILEGES;
MariaDB [psa]> exit;

MySQL
​x
 
# plesk db
MariaDB [psa]> CREATE USER 'root'@'localhost' IDENTIFIED BY 'password';
MariaDB [psa]> GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost';
MariaDB [psa]> FLUSH PRIVILEGES;
MariaDB [psa]> exit;

Pongo el hilo del error en ingles… por si aclaran algo mas