If you are trying to enqueue jquery’s autocomplete in wordpress, I’d suggest just using the remote version through google’s CDN / API site. You can deregister the jquery-ui with the first line of code, re-register it with the second line of code, and then activate it with the third line of code:
wp_deregister_script('jquery-ui');
wp_register_script('jquery-ui','http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js',array('jquery'));
wp_enqueue_script('jquery-ui');
You may also want to enqueue the styles using something like:
wp_enqueue_style('jquery-style', 'http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.2/themes/smoothness/jquery-ui.css');
And more recently I found this project on GitHub which has some nice examples and code that may be more updated than the version included with wordpress:
https://github.com/dyve/jquery-autocomplete
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