Hello, All,

When we updated the openscholar version from beta 13 into beta 14 (just run the update.php, haven't update the drupal core yet) , all edit / add new functions are fine. but the delete function from website block is not working. when I try to remove the member from one personal site or make the member into administrator role for specific site, delete specific class / image from website, it should pop up the confirmation box. But it always shows that the error happened.
for example, if want to delete a class, it should pop up confirmation box, it shows error happened on .../node/9/delete?destination=classes.

checked php error log file, it shows that php fatal error: call to undefined function vsite_get_referrers() in ...\sites\all\modules\openscholar_features\scholar_classes\scholar_classes.module.

How to fix this problem?
Thanks you for your help.