I have just downloaded and installed AcyMailing Enterprise on a Joomla! website. Previously I'd been running an earlier free version. I'm now unable to access any of the articles on the site. When I click on Content/Articles I get an almost blank screen with the words "Call to undefined function acymailing_addScript()" The only other thing visible on the screen is a 'Return to Control Panel' button.
I've no idea what it means or, more particularly, how to fix the problem.
All the other sub-menu items under Content are working fine. Can someone please give me some nice simple instructions for sorting this out.