You are loading jQuery 1.8.3 and jQuery 1.9.1. 1.8.3 loads from wp-includes. 1.9.1 loads from Google. Install JSView on FireFox and right click the page. You will see them. There are two Javascript files, both named jquery.js.
You need to work out what is loading those two scripts and make sure that only one jQuery gets loaded, and it will have to be the right one. Hopefully that is the most recent one– 1.9.1
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