Error message

• Warning: Cannot modify header information - headers already sent by (output started at /home/barojon1/public_html/drupal/includes/common.inc:2700) in drupal_send_headers() (line 1217 of /home/barojon1/public_html/drupal/includes/bootstrap.inc).
• Error: Class 'FormBuilderFormBase' not found in form_builder_cron() (line 424 of /home/barojon1/public_html/drupal/sites/all/modules/form_builder/form_builder.module).