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Error message

Warning: Cannot modify header information - headers already sent by (output started at /code/sites/default/settings.php:1) in drupal_send_headers() (line 1506 of /code/includes/bootstrap.inc).
PDOException: SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) in lock_may_be_available() (line 167 of /code/includes/lock.inc).