Fatal error: Call to undefined function og_is_group_type() in /var/www/sites/all/modules/civicrm/drupal/modules/civicrm_og_sync/civicrm_og_sync.module on line 43

Fatal error: Call to undefined function og_is_group_type() in /var/www/sites/all/modules/civicrm/drupal/modules/civicrm_og_sync/civicrm_og_sync.module on line 43