Warning: PDO::query(): MySQL server has gone away in /var/www/html/classes/db/DbPDO.php on line 165

Warning: PDO::query(): Error reading result set's header in /var/www/html/classes/db/DbPDO.php on line 165

Fatal error: Uncaught PrestaShopException: Link to database cannot be established: SQLSTATE[HY000] [2002] Connection refused in /var/www/html/classes/db/DbPDO.php:136 Stack trace: #0 /var/www/html/classes/db/Db.php(379): DbPDOCore->connect() #1 /var/www/html/classes/db/Db.php(663): DbCore->query('\n\t\t\t\tSELECT id_...') #2 /var/www/html/classes/db/Db.php(697): DbCore->getRow('\n\t\t\t\tSELECT id_...', true) #3 /var/www/html/classes/ObjectModel.php(1647): DbCore->getValue('\n\t\t\t\tSELECT id_...') #4 /var/www/html/config/config.inc.php(224): ObjectModelCore->isAssociatedToShop() #5 /var/www/html/index.php(27): require('/var/www/html/c...') #6 {main} thrown in /var/www/html/classes/db/DbPDO.php on line 136