Hello,
Errors on the cart page caused by code that you added on the cart page http://prntscr.com/h6y3d0 and these errors appear even with default theme http://prntscr.com/h6y30q
Once I remove the code any error appears. So, contact Mail Chimp plugin author to find out why you need this code on the cart page and do you really need that code there?
Regards
