TypeError: $(…).autocomplete is not a function

you missed jquery ui library. Use CDN of Jquery UI or if you want it locally then download the file from Jquery Ui

<link href="http://code.jquery.com/ui/1.10.2/themes/smoothness/jquery-ui.css" rel="Stylesheet">
<script src="YourJquery source path"></script>
<script src="http://code.jquery.com/ui/1.10.2/jquery-ui.js" ></script>