Erreur : SQLSTATE[HY000] [2002] Network is unreachable

Fatal error: Uncaught Error: Call to a member function prepare() on bool in /var/www/prod/application/modele/base/db/pdo/PDODBAdapter.class.php:25 Stack trace: #0 /var/www/prod/application/modele/base/queries/Query.class.php(47): PDODBAdapter->prepare('SELECT * FROM w...') #1 /var/www/prod/application/libs/Session.php(36): Query->execute() #2 /var/www/prod/application/libs/Controleur.php(17): Session::init() #3 /var/www/prod/application/controleur/accueil.php(9): Controleur->__construct() #4 /var/www/prod/application/libs/Application.php(43): Accueil->__construct() #5 /var/www/prod/index.php(49): Application->__construct() #6 {main} thrown in /var/www/prod/application/modele/base/db/pdo/PDODBAdapter.class.php on line 25