Trying to populate table from SQL database

I have 2 databases with several tables in them. Both of these databases are from SQL Server Management Studio 2012 Express. I am following this example: http://www.datatables.net/release-datatables/examples/server_side/server_side.html . However, I'm getting this error in a popup:

"DataTables warning (table id = 'example'): Requested unknown parameter '1' from the data source for row 0"

This is my code for the table in the .cshtml file:

<div id="allDepTable">
    <table class="display" id="example">
        <thead>
            <tr>
                <th>PRIMARY HEADINGS</th>
                <th>PRIMARY CLASS CODE</th>
                <th>PH DESCRIPTION</th>
            </tr>
	</thead>

        <tbody>
            <tr>
                <td class="dataTables_empty">Loading data from server</td>
            </tr>
        </tbody>

        <tfoot>
            <tr>
                <th>PRIMARY HEADINGS</th>
                <th>PRIMARY CLASS CODE</th>
                <th>PH DESCRIPTION</th>
            </tr>
	</tfoot>
    </table>
</div>

The .js file:

$(document).ready(function () {
    $('#example').dataTable();
});

$(document).ready(function() {
    $('#example').dataTable( {
        "bProcessing": true,
        "bServerSide": true,
        "sAjaxSource": "scripts/server_processing.php"
    } );
} );

The .php file:

<?php
	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
	 * Easy set variables
	 */
	
	/* Array of database columns which should be read and sent back to DataTables. Use a space where
	 * you want to insert a non-database field (for example a counter or static image)
	 */
	$aColumns = array( 'Primary Headings', 'Primary Class Code', 'PH Description' );
	
	/* Indexed column (used for fast and accurate table cardinality) */
	$sIndexColumn = "Primary Class Code";
	
	/* DB table to use */
	$sTable = "ajax";
	
	/* Database connection information */
	$gaSql['user']       = "";
	$gaSql['password']   = "";
	$gaSql['db']         = "DBNAME";
	$gaSql['server']     = "DBSERVERNAME";
	
	/* REMOVE THIS LINE (it just includes my SQL connection user/pass) */
	/*include( $_SERVER['DOCUMENT_ROOT']."/datatables/mysql.php" );*/
	
	
	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
	 * If you just want to use the basic configuration for DataTables with PHP server-side, there is
	 * no need to edit below this line
	 */
	
        >>>> ... Same as example file from here down
?>

My database contains 3 columns, with 14 rows. The first column contains strings, the second column contains characters, and the third column contains strings.

Thanks for the help