Error message

• Warning: Cannot modify header information - headers already sent by (output started at /home/zumba624/public_html/includes/common.inc:2585) in drupal_send_headers() (line 1054 of /home/zumba624/public_html/includes/bootstrap.inc).
• Error: Class 'video_conversion' not found in video_cron() (line 119 of /home/zumba624/public_html/sites/all/modules/video/video.module).