Unfortunately i allowed a J3 site to upgrade to Helix 2.2.0 and it stuffed up the website.
I ahev managed to get it foing by diabling the plugin "System - Helix Ultimate Framework" and switching the template back to Protostar.
I have tried to reinstall Helix 2.1.2 which is the oldest version i have downloaded but thsi does not fix the problem. It looks like a i need an old version of the framework to reinstall
Sadly I cant find anywhere on your website to download old versiosn of the Helix template or the helix framework.
Can you provide links to the last version of the template vere 2.1.3 and the framework that works on J3 please