popover is not a function bootstrap 4 code example

Example: .popover is not a function

<script type="text/javascript" src="jquery-3.1.1.min.js"></script>
<script type="text/javascript" src="bootstrap.min.js"></script>

<script>
// $j optional alias to jQuery noConflict()
var $j = jQuery.noConflict();

$j(document).ready(function() {
	$j('[data-toggle="popover"]').popover();
});
</script>