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

Warning: PDO::query(): Error reading result set's header in /var/www/html/prestashop/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/prestashop/classes/db/DbPDO.php:136 Stack trace: #0 /var/www/html/prestashop/classes/db/Db.php(379): DbPDOCore->connect() #1 /var/www/html/prestashop/classes/db/Db.php(613): DbCore->query('SELECT * FROM `...') #2 /var/www/html/prestashop/classes/module/Module.php(2244): DbCore->executeS('SELECT * FROM `...', false) #3 /var/www/html/prestashop/classes/Hook.php(872): ModuleCore::getExceptionsStatic('62', '136') #4 /var/www/html/prestashop/classes/Dispatcher.php(357): HookCore::exec('actionDispatche...', Array) #5 /var/www/html/prestashop/index.php(28): DispatcherCore->dispatch() #6 {main} thrown in /var/www/html/prestashop/classes/db/DbPDO.php on line 136