Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away in /www/wwwroot/edusoho.com/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:105 Stack trace: #0 /www/wwwroot/edusoho.com/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php(105): PDOStatement->execute(Array) #1 /www/wwwroot/edusoho.com/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(849): Doctrine\DBAL\Driver\PDOStatement->execute(Array) #2 /www/wwwroot/edusoho.com/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(510): Doctrine\DBAL\Connection->executeQuery('SELECT * FROM b...', Array, Array) #3 /www/wwwroot/edusoho.com/vendor/codeages/biz-framework/src/Dao/GeneralDaoImpl.php(216): Doctrine\DBAL\Connection->fetchAssoc('SELECT * FROM b...', Array) #4 /www/wwwroot/edusoho.com/vendor/codeages/biz-framework/src/Session/Dao/Impl/SessionDaoImpl.php(26): Codeages\Biz\Framework\Dao\GeneralDaoImpl->getByFields(Array) #5 [internal function]: Codeages\Biz\Framework\Session\Dao\Impl\SessionDaoImpl-> in /www/wwwroot/edusoho.com/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php on line 115