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Today we tried to check our website but we found this error. I don't know what happened exactly.

PDOException: SQLSTATE[HY000] [2002] No such file or directory in Drupal\Component\DependencyInjection\PhpArrayContainer->createService() (line 79 of /var/www/html/core/lib/Drupal/Component/DependencyInjection/PhpArrayContainer.php).

Please I need help to fix this error as soon as possible.

Thank you.