Error message from WordPress

Hi, I recently received the message below from WP. There don’t appear to be any visible issues. But I don’t know much about this.

would appreciate the help.

Thanks
___________________________

Howdy!

Since WordPress 5.2 there is a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email.

In this case, WordPress caught an error with one of your plugins, MailPoet 3 (New).

First, visit your website (https://rulingclassobserver.com/) and check for any visible issues. Next, visit the page where the error was caught (https://rulingclassobserver.com/wp-admin/widgets.php) and check for any visible issues.

Please contact your host for assistance with investigating this issue further.

If your site appears broken and you can’t access your dashboard normally, WordPress now has a special “recovery mode”. This lets you safely login to your dashboard and investigate further.

https://rulingclassobserver.com/wp-login.php?action=enter_recovery_mode&rm_token=IRLbXICQMTjghKh2uReH0f&rm_key=fvXCQ7ECWhXyIRX66pvFN8

To keep your site safe, this link will expire in 1 day. Don’t worry about that, though: a new link will be emailed to you if the error occurs again after it expires.

When seeking help with this issue, you may be asked for some of the following information:
WordPress version 5.4.2
Current theme: GeneratePress (version 2.4.2)
Current plugin: MailPoet 3 (New) (version 3.47.10)
PHP version 7.3.18

Error Details
=============
An error of type E_ERROR was caused in line 2 of the file /home/customer/www/rulingclassobserver.com/public_html/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php. Error message: Uncaught PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away in /home/customer/www/rulingclassobserver.com/public_html/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:2
Stack trace:
#0 /home/customer/www/rulingclassobserver.com/public_html/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php(2): PDO->query(‘SELECT w0_.name…’)
#1 /home/customer/www/rulingclassobserver.com/public_html/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(2): MailPoetVendor\Doctrine\DBAL\Driver\PDOConnection->query(‘SELECT w0_.name…’)
#2 /home/customer/www/rulingclassobserver.com/public_html/wp-content/plugins/mailpoet/vendor-prefixed/doctrine/orm/lib/Doctrine/ORM/Query/Exec/SingleSelectExecutor.php(2): MailPoetVendor\Doctrine\DBAL\Connection->executeQuery(‘SELECT w0_.name…’, Array, Array, NULL)
#3 /home/customer/www/rulingclassobserver.com/public_html/wp-conten