Error message

• Warning: Cannot modify header information - headers already sent by (output started at /chroot/home/pvmacomp/pvma.com.ph/html/includes/common.inc:2797) in drupal_send_headers() (line 1499 of /chroot/home/pvmacomp/pvma.com.ph/html/includes/bootstrap.inc).
• PDOException: SQLSTATE[HY000]: General error: 1036 Table 'semaphore' is read only: DELETE FROM {semaphore} WHERE (name = :db_condition_placeholder_0) AND (value = :db_condition_placeholder_1) AND (expire <= :db_condition_placeholder_2) ; Array ( [:db_condition_placeholder_0] => cron [:db_condition_placeholder_1] => 118891022967f7b8114a27c4.90527038 [:db_condition_placeholder_2] => 1744288001.3038 ) in lock_may_be_available() (line 181 of /chroot/home/pvmacomp/pvma.com.ph/html/includes/lock.inc).