Even though I've followed the directions in the jQuery UI documentation, I'm getting the error that .sortable is not a function.

Here is my code:

<div style=float: left;>

    <span class=caption style=width: 255px; display: block;>

        Assigned Limits

    </span>

    <div class=assigned-limit-box>

        <ul id=limAssigned class=ul-base>

        </ul>

    </div>

</div>

This is my js:

$('#limAssigned').sortable();

My jQuery js is loaded before my jQuery UI js.

What am I doing wrong?