PHP Error on simplest of pages - mysql_fetch_array()

I have the simplest of scripts to load TWO queries onto a TCPDF pdf file.

As the code stands it throws the following error:

Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\gf3dataservices\tcpdf_5_9_207\tcpdf_table_1.1.0\tcpdf_table\xxxtemp1.php on line 48
TCPDF ERROR: Some data has already been output, can't send PDF file

This is Line 48

while ($data = mysql_fetch_array($result2))

I am basically running a query from my db and then trying to get a second test query to run and include on the output.

I can remove the section //First Query and Output and it will work and output the second query I can remove the section //Second Query and Output and it will work and output the first query

However I CANNOT keep them both in - it just wont work - driving me mad

<?php
require_once ('tcpdf/config/lang/eng.php');
require_once ('tcpdf/tcpdf.php');
require_once ('connection.php');

$pdf = new TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);

// set font
$pdf->SetFont('times', '', 11);

// landscape
$pdf->addPage( 'L', 'LETTER' );

//First Query and Output

$result = mysql_query("CALL C01_Client_Summary_ByAccount(1, '2012-02-27', '2013-03-29');", $con);

$html = '
<table border="1" cellspacing="3" cellpadding="4">
<tr>
<th align="center"><b>a</b></th>
<th align="center"><b>b</b></th>
</tr></table>';

while ($data = mysql_fetch_array($result))
{

$html .= '<table border="1"><tr>
<td align="center">'.$data['CommisionPercentage'].'</td>
 <td align="center">'.$data['Turnover'].'</td>
</tr></table> ';
}


$pdf->writeHTML($html, true, false, true, false, ''); //for generate

//Second Query and Output

$result2 = mysql_query("Select 1 as a, 2 as b");

$html = '
<table border="1" cellspacing="3" cellpadding="4">
<tr>
<th align="center"><b>a</b></th>
<th align="center"><b>b</b></th>
</tr></table>';

while ($data = mysql_fetch_array($result2))
{

$html .= '<table border="1"><tr>
<td align="center">'.$data['a'].'</td>
<td align="center">'.$data['b'].'</td>
</tr></table> ';

}

$pdf->writeHTML($html, true, false, true, false, ''); //for generate

$pdf->Output('FormPantauExpLocalAll', 'I'); // for generate pdf file

?>