Activating Watson Conversation Plugin Doesnt Work

Hi i am trying to activate the plugin from the dashborad but i get this error:

Warning: mysqli_query(): MySQL server has gone away in /var/www/html/wp-includes/wp-db.php on line 1924

Warning: mysqli_query(): Error reading result set’s header in /var/www/html/wp-includes/wp-db.php on line 1924
Error reconnecting to the database
This means that we lost contact with the database server at mysql. This could mean your host’s database server is down.

Are you sure that the database server is running?
Are you sure that the database server is not under particularly heavy load?