Basic Things To Check
Search on src=" for included libraries, e.g.:
<script src="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.js"></script>
Make sure you haven't included multiple versions of the same library or the same library multiple times.
Feel free to comment if you can add help to this page or point out issues and solutions you have found. I do not provide support on this site, if you need help with a problem head over to stack overflow.