Error message

• Warning: Cannot modify header information - headers already sent by (output started at /home/sl/wwwsrc/drupal-7.2/includes/common.inc:2562) in drupal_send_headers() (line 1039 of /home/sl/wwwsrc/drupal-7.2/includes/bootstrap.inc).
• PDOException: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'drupal53jur.jurcaptcha_sessions' doesn't exist: DELETE FROM {captcha_sessions} WHERE (timestamp < :db_condition_placeholder_0) ; Array ( [:db_condition_placeholder_0] => 1329892183 ) in captcha_cron() (line 151 of /home/sl/wwwsrc/drupal-7.2/sites/all/modules/captcha/captcha.module).