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Paypal の寄付 Web ページでこのエラーが表示されますが、停止する方法がわかりません。

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/sixthr6/public_html/donation/donate.php on line 116

これを修正する方法が見つかるまで、これを DEMO モードで実行しています。正しいテーブルを使用してカスタムの mySQL データベースをセットアップしているため、DEMO モードで偽の寄付を行うと、コメントがメイン ページに保存されず、エラーが発生する理由がわかりません。

ここに問題のコードがあります

    <?php

require "config.php";
require "connect.php";

// Determining the URL of the page:
$url = 'http://'.$_SERVER['SERVER_NAME'].dirname($_SERVER["REQUEST_URI"]);

// Fetching the number and the sum of the donations:
list($number,$sum) = mysql_fetch_array(mysql_query("SELECT COUNT(*),SUM(amount) FROM dc_donations"));

// Calculating how many percent of the goal were met:
$percent = round(min(100*($sum/$goal),100));

// Building a URL with Google's Chart API:
$chartURL = 'http://chart.apis.google.com/chart?chf=bg,s,f9faf7&amp;cht=p&amp;chd=t:'.$percent.',-'.(100-$percent).'&amp;chs=200x200&amp;chco=639600&amp;chp=1.57';

?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Donation Center | Tutorialzine demo</title>

<link rel="stylesheet" type="text/css" href="styles.css" />

</head>

<body>

<div id="main">
    <h1>Donation Center</h1>
    <h2>Show Your Support for our Cause</h2>

    <div class="lightSection">
        <h3>Hello, dear visitor!</h3>
        <p>This is Tutorialzine's Donation Center. It utilizes PayPal's APIs to bring you a fully fledged donation solution. It is currently in <strong>Demo Mode</strong>, which means that PayPal is bypassed and you can donate as much as you want to test the functionality. You can, however, just change a variable in the config.php file to enable real donations.</p>    

        <!-- The PayPal Donation Button -->

      <form action="<?php echo $payPalURL?>" method="post" class="payPalForm">
        <div>
            <input type="hidden" name="cmd" value="_donations" />
            <input type="hidden" name="item_name" value="Donation" />

            <!-- Your PayPal email: -->
            <input type="hidden" name="business" value="<?php echo $myPayPalEmail?>" />

            <!-- PayPal will send an IPN notification to this URL: -->
            <input type="hidden" name="notify_url" value="<?php echo $url.'/ipn.php'?>" /> 

            <!-- The return page to which the user is navigated after the donations is complete: -->
            <input type="hidden" name="return" value="<?php echo $url.'/thankyou.php'?>" /> 

            <!-- Signifies that the transaction data will be passed to the return page by POST -->
            <input type="hidden" name="rm" value="2" /> 


            <!--    General configuration variables for the paypal landing page. Consult 
                    http://www.paypal.com/IntegrationCenter/ic_std-variable-ref-donate.html for more info  -->

            <input type="hidden" name="no_note" value="1" />
            <input type="hidden" name="cbt" value="Go Back To The Site" />
            <input type="hidden" name="no_shipping" value="1" />
            <input type="hidden" name="lc" value="US" />
            <input type="hidden" name="currency_code" value="USD" />


            <!-- The amount of the transaction: -->

            <select name="amount">
                <option value="50">$50</option>
                <option value="20">$20</option>
                <option value="10" selected="selected">$10</option>
                <option value="5">$5</option>
                <option value="2">$2</option>
                <option value="1">$1</option>
            </select>

            <input type="hidden" name="bn" value="PP-DonationsBF:btn_donate_LG.gif:NonHostedGuest" />

            <!-- You can change the image of the button: -->
            <input type="image" src="https://www.paypal.com/en_US/i/btn/btn_donate_LG.gif" name="submit" alt="PayPal - The safer, easier way to pay online!" />

          <img alt="" src="https://www.paypal.com/en_US/i/scr/pixel.gif" width="1" height="1" />
        </div>
        </form>

    </div>

    <!-- Setting the Google Chart API address as the background image of the div: -->

    <div class="chart" style="background:url('<?php echo $chartURL?>');">
        Our Goal
    </div>

    <div class="donations">
        <?php echo $percent?>% done
    </div>


    <div class="clear"></div>

    <div class="donors">
        <h3>The Donor List</h3>
        <h4>Folks Who Showed Their Support</h4>

        <div class="comments">

        <?php
            $comments = mysql_query("SELECT * FROM dc_comments ORDER BY id DESC");

            // Building the Donor List:

            if(mysql_num_rows($comments)) 
            {
                while($row = mysql_fetch_assoc($comments))
                {
                    ?>

                        <div class="entry">
                            <p class="comment">
                            <?php 
                                echo nl2br($row['message']); // Converting the newlines of the comment to <br /> tags
                            ?>
                            <span class="tip"></span>
                            </p>

                            <div class="name">
                                <?php echo $row['name']?> <a class="url" href="<?php echo $row['url']?>"><?php echo $row['url']?></a>
                            </div>
                        </div>

                    <?php
                }
            }
        ?>


        </div> <!-- Closing the comments div -->

    </div> <!-- Closing the donors div -->

</div> <!-- Closing the main div -->


</body>
</html>

私はこのウェブサイトhttp://tutorialzine.com/2010/05/donation-center-php-mysql-paypal-api/のコーディングを使用しており、デモは正常に動作していますが、私のものを使用して設定すると、彼らはまだエラーを投げています。

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