Error message

• Warning: Cannot modify header information - headers already sent by (output started at /home/mdcengin/www/includes/common.inc:2754) in drupal_send_headers() (line 1232 of /home/mdcengin/www/includes/bootstrap.inc).
• PDOException: SQLSTATE[HY000]: General error: 11 database disk image is malformed: INSERT INTO {watchdog} (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?); Array ( [0] => 0 [1] => cron [2] => %type: !message in %function (line %line of %file). [3] => a:6:{s:5:"%type";s:12:"PDOException";s:8:"!message";s:197:"SQLSTATE[HY000]: General error: 11 database disk image is malformed: DELETE FROM {watchdog} WHERE (wid < :db_condition_placeholder_0) ; Array ( [:db_condition_placeholder_0] => 25747 ) ";s:9:"%function";s:12:"dblog_cron()";s:5:"%file";s:45:"/home/mdcengin/www/modules/dblog/dblog.module";s:5:"%line";i:119;s:14:"severity_level";i:3;} [4] => 3 [5] => [6] => http://mdc-engineering.net/it/documentazione [7] => [8] => 54.198.86.28 [9] => 1529286367 ) in dblog_watchdog() (line 160 of /home/mdcengin/www/modules/dblog/dblog.module).