Creat items

[mordeng]

i get this errors when i try to edit, and to create a item:
happend since i updated to 2.0.7

Warning: shell_exec() has been disabled for security reasons in /users/bodega/www/joomla/administrator/components/com_virtuemart/models/orderstatus.php on line 79

Fatal error: Call to a member function getProductShoppersByStatus() on a non-object in /users/bodega/www/joomla/administrator/components/com_virtuemart/views/product/view.html.php on line 183