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Error message

Warning: Cannot modify header information - headers already sent by (output started at /home/ecofinco/www/site/index.php:91) in drupal_send_headers() (line 1212 of /home/ecofinco/www/site/includes/bootstrap.inc).
PDOException: SQLSTATE[HY000] [2005] Unknown MySQL server host 'mysql51-48.pro' (2) in lock_may_be_available() (line 167 of /home/ecofinco/www/site/includes/lock.inc).