"PHP Text Statistics" Function Implementation Not Working

I'm trying to implement this:
http://code.google.com/p/php-text-statistics/
But it doesn't seem to be working, I did indeed download the file and upload it to my server as well.
Right now I have this much:

<?php	
/* Yes, I did rename the file */
require_once('inc/rlevel.class.php');

$statistics = new TextStatistics;
$text = 'The quick brown fox jumped over the lazy dog.';
echo $statistics->flesch_kincaid_reading_ease($text);

?>

Code (markup):

Any mind taking a shot at it? Thanks.

 

Unfortunately, that doesn't work either. Include doesn't make any difference either.