Error message

• Warning: Cannot modify header information - headers already sent by (output started at /web/htdocs/www.sissrl.net/home/includes/common.inc:2758) in drupal_send_headers() (line 1267 of /web/htdocs/www.sissrl.net/home/includes/bootstrap.inc).
• PDOException: SQLSTATE[HY000]: General error: 11 database disk image is malformed: DELETE FROM {cache_bootstrap} WHERE (cid = :db_condition_placeholder_0) ; Array ( [:db_condition_placeholder_0] => variables ) in cache_clear_all() (line 167 of /web/htdocs/www.sissrl.net/home/includes/cache.inc).