使用PHP的htmlSQL时遇到致命错误

I am trying to use PHP to grap some information from the webpage. I have found recommendations to use htmlSQL which makes easy to get specific value from HTML. I have read all the examples coming with it, hovewer, I've got a very simple issue. When I execute my script, the output shows

PHP Fatal error:  Class 'htmlsql' not found in /home/jeff/htmlsql2.php on line 5

I have downloaded the htmlsql.class.php document from the website and put it in the HOME. could anyone can help me fix this issue?

The following is my code. In this case I want to get the all product names from the web page.

<?php
    //using htmlSQL to scrap the web, reference url http://www.devquotes.com/2010/12/07/seo-scraping-with-websql/
    include_once("htmlsql.class.php");

    //create new htmlsql and link the web
    $wsql = new htmlsql();
    if (!$wsql->connect('url','http://m.dicksmith.com.au/#/Product/Search?query=IPOD')){
        print 'Error while connecting:' . $wsql->error;
        exit;
    }  

    //limit range
    $wsql->isolate_content('<div class="productItemInner">', '</div>');

    //try to fetch 
    if(!$wsql->query('SELECT * FROM p WHERE $class=="blueFont largeFont"')){
        print "Query error:".$wsql->error;
        exit;
    }

    foreach($wsql->fetch_array() as $row){
        print_r($row);
    }
?>