ADMIN CAN YOU HELP ME PLZ?

sencha has caught an error:
Trying to get property of non-object
An error has been thrown (error #8). Study the details below to resolve the error.

Message: Trying to get property of non-object
File: /var/www2/gts4/classes/mvc/models/gts_FileModel.inc.php
Line: #384

ADMIN EVERY TIME I TRY TO DELETE A PICTURE I GET TIS ERROR MESSAGE AND IT WONT DELETE..
MAGGIE

Maggie Barclay

4 weeks ago