Error message

• Warning: Cannot modify header information - headers already sent by (output started at /home/sptserve/public_html/includes/common.inc:2607) in drupal_send_headers() (line 1239 of /home/sptserve/public_html/includes/bootstrap.inc).
• PDOException: There is already an active transaction in dblog_watchdog() (line 157 of /home/sptserve/public_html/modules/dblog/dblog.module).