Simple campain doesn't send emails

Hi Mautic friend!
I’m getting crazy. I have set a simple campain: when I manually switch a user to a specific segment then send email, see the picture attached. but no email is sent. If I send email manunally, it works… What I’m doing wrong ?

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Here the log:

`[2018-02-17 10:37:15] mautic.WARNING: PHP Warning - Error while sending QUERY packet. PID=321456 - in file /home/killyk5/public_html/follower/mautic/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php - at line 105 [] []
[2018-02-17 10:37:15] mautic.CRITICAL: Uncaught PHP Exception Doctrine\DBAL\Exception\DriverException: “An exception occurred while executing ‘SELECT t0.id AS id_1, t0.ip_address AS ip_address_2, t0.ip_details AS ip_details_3 FROM mau_ip_addresses t0 WHERE t0.ip_address = ? LIMIT 1’ with params [“185.48.143.2”]: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away” at /home/killyk5/public_html/follower/mautic/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php line 115 {“exception”:"[object] (Doctrine\DBAL\Exception\DriverException(code: 0): An exception occurred while executing ‘SELECT t0.id AS id_1, t0.ip_address AS ip_address_2, t0.ip_details AS ip_details_3 FROM mau_ip_addresses t0 WHERE t0.ip_address = ? LIMIT 1’ with params [“185.48.143.2”]:\n\nSQLSTATE[HY000]: General error: 2006 MySQL server has gone away at /home/killyk5/public_html/follower/mautic/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php:115, Doctrine\DBAL\Driver\PDOException(code: HY000): SQLSTATE[HY000]: General error: 2006 MySQL server has gone away at /home/killyk5/public_html/follower/mautic/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:107, PDOException(code: HY000): SQLSTATE[HY000]: General error: 2006 MySQL server has gone away at /home/killyk5/public_html/follower/mautic/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:105)"} []