Easypiechart.js not working

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Javascript

jQuery

plugin

I am trying to use the easypiechart, but i don't know why it is not showing any thing...

i add the easypiechart.js and the below code before the <pre lang="HTML"></body>

<script type="text/javascript">
    $(function() {
        $('.Chart').easyPieChart({
            //your configuration goes here
            size:170,
            animate: 2000,
            lineCap:'butt',
            scaleColor: false,
            barColor: '#ccc',
            lineWidth: 10
        });
    });
</script>

in my html i call the piechart using this code..

<div class="Chart" data-percent="73"><span class="percent">73%</span></div>

the result look like...

73%

there is no circle show arround 73%.

please solve with example code...