Layer slider that was working before updating stopped showing slides, and started to push errors in console.log after update to latest ENFOLD version.
Here is a screenshot – https://monosnap.com/direct/OmqESuRCgLZLBGfiuizlncRKBQ6Mxq
It seems that some sort of integration is broken, it could be caused by new performance settings – for example Disable jQuery Migrate – but currently disabling it didn’t help.
I took a look at your site and exported your slider to my localhost, were the slider worked fine.
I have also tried matching all of your performance settings, yet I was not able to recreate the error.
The error “Cannot tween a null target” seems to refer to “animating something that does not exists or is invalid” with greensock.js, yet I don’t see that you are using this animation. Do you recall using greenstock on a element?
I found another reference to this and layerslider here.
Please try disabling your plugins to see if this helps.