how did you get that errors message via thru the Chrome Console? (I'm no longer that experienced but) Go check here yourself. Given that the script ran pefectly good enough for two years, can you suspect of any motive why it ought to have misplaced the functionn reference on its own?
I moved your post to a new thread - I don't see anything wrong with your site - can give some more details as to what isn't working
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