Fix for warning message in include\utils\ListViewUtils.php
in include\utils\ListViewUtils.php
change in function decode_html($str)
from if ($_REQUEST['action'] == 'Popup' || _REQUEST['file'] == 'Popup') to if ((isset(_REQUEST['action']) && _REQUEST['action'] == 'Popup') ||(isset(_REQUEST['action']) && $_REQUEST['file'] == 'Popup'))