Ext not defined VirtueMart
I’ve installed VirtueMart on one of my websites, when I opened the VirtueMart Control Panel in my Joomla! Administration Panel I noticed that when the view is set to Simple Layout all the tabs “Accordion Menu” are extended and I get the following JavaScript error: Ext not defined and most functionality that includes JavaScript is disabled. When I click on Extended Layout the problem is solved.
Solution:
To solve this problem we need to disable the usefetchscript function that VirtueMart uses
Open the /administrator/components/com_virtuemart/virtuemart.cfg.php file and add the following line
$_REQUEST['usefetchscript'] = "0";
above the line
global $mosConfig_absolute_path,$mosConfig_live_site;
and save your changes.
Refresh the VirtueMart Administration Panel and the problem will be solved.