Popovers plugin causing internal server error

This is actually about the Popovers plugin, but I can’t select it from your menu, since I have it turned off on the website (jojoelectroclothing.com)

Ever since the first pass attempt to allow compatibility with caching plugins (we’re W3 Total Cache, and the site is also tuned by the plugin developers), trying to activate the Popovers plugin causes an internal server error.

Is there any way someone can take a look? it’s been quite a while and I’d like to get this issue addressed at your earliest convenience. Thank you!