DataTables warning: table id=example - Invalid JSON response. For more information about this error,

Getting error " DataTables warning: table id=example - Invalid JSON response. For more information about this error, "

HTML

<table id="example" class="display" cellspacing="0" width="100%">
    <thead>
        <tr>
            <th>First name</th>
            <th>Last name</th>
            <th>Position</th>
            <th>Office</th>
            <th>Start date</th>
            <th>Salary</th>
            <!-- <th>Edit</th> -->
        </tr>
    </thead>
 
    <tfoot>
        <tr>
            <th>First name</th>
            <th>Last name</th>
            <th>Position</th>
            <th>Office</th>
            <th>Start date</th>
            <th>Salary</th>
            <!-- <th>Edit</th> -->
        </tr>
    </tfoot>
</table>

script

<script>
                $(document).ready(function() {
                        $('#example').dataTable( {
                               "pagingType": "full_numbers",
                               "scrollY": 380,
                               "scrollX": true,
                               "processing": true,
                               "serverSide": true,
                               "ajax":{
                                "url": "server_processing.php",
            "dataType": "jsonp"
         } 
</script>

server_processing.php

<?php
    /*
     * Script:    DataTables server-side script for PHP and MySQL
     * Copyright: 2010 - Allan Jardine
     * License:   GPL v2 or BSD (3-point)
     */
     
    /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
     * 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( 'memo_name', 'add_by_date', 'add_by_userid', 'add_by_id', 'add_by_datetime' );
     
    /* Indexed column (used for fast and accurate table cardinality) */
    $sIndexColumn = "id";
     
    /* DB table to use */
    $sTable = "memodn";
     
    /* Database connection information */
    $gaSql['user']       = "root";
    $gaSql['password']   = "";
    $gaSql['db']         = "test";
    $gaSql['server']     = "localhost";
     
     
    /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
     * If you just want to use the basic configuration for DataTables with PHP server-side, there is
     * no need to edit below this line
     */
     
    /*
     * Local functions
     */
    function fatal_error ( $sErrorMessage = '' )
    {
        header( $_SERVER['SERVER_PROTOCOL'] .' 500 Internal Server Error' );
        die( $sErrorMessage );
    }
 
     
    /*
     * MySQL connection
     */
    if ( ! $gaSql['link'] = mysql_pconnect( $gaSql['server'], $gaSql['user'], $gaSql['password']  ) )
    {
        fatal_error( 'Could not open connection to server' );
    }
 
    if ( ! mysql_select_db( $gaSql['db'], $gaSql['link'] ) )
    {
        fatal_error( 'Could not select database ' );
    }
     
     
    /*
     * Paging
     */
    $sLimit = "";
    if ( isset( $_GET['iDisplayStart'] ) && $_GET['iDisplayLength'] != '-1' )
    {
        $sLimit = "LIMIT ".intval( $_GET['iDisplayStart'] ).", ".
            intval( $_GET['iDisplayLength'] );
    }
     
     
    /*
     * Ordering
     */
    if ( isset( $_GET['iSortCol_0'] ) )
    {
        $sOrder = "ORDER BY  ";
        for ( $i=0 ; $i<intval( $_GET['iSortingCols'] ) ; $i++ )
        {
            if ( $_GET[ 'bSortable_'.intval($_GET['iSortCol_'.$i]) ] == "true" )
            {
                $sOrder .= $aColumns[ intval( $_GET['iSortCol_'.$i] ) ]."
                    ".($_GET['sSortDir_'.$i]==='asc' ? 'asc' : 'desc').", ";
            }
        }
         
        $sOrder = substr_replace( $sOrder, "", -2 );
        if ( $sOrder == "ORDER BY" )
        {
            $sOrder = "";
        }
    }
     
     
    /*
     * Filtering
     * NOTE this does not match the built-in DataTables filtering which does it
     * word by word on any field. It's possible to do here, but concerned about efficiency
     * on very large tables, and MySQL's regex functionality is very limited
     */
    $sWhere = "";
    if ( $_GET['sSearch'] != "" )
    {
        $sWhere = "WHERE (";
        for ( $i=0 ; $i<count($aColumns) ; $i++ )
        {
            if ( isset($_GET['bSearchable_'.$i]) && $_GET['bSearchable_'.$i] == "true" )
            {
                $sWhere .= $aColumns[$i]." LIKE '%".mysql_real_escape_string( $_GET['sSearch'] )."%' OR ";
            }
        }
        $sWhere = substr_replace( $sWhere, "", -3 );
        $sWhere .= ')';
    }
     
    /* Individual column filtering */
    for ( $i=0 ; $i<count($aColumns) ; $i++ )
    {
        if ( $_GET['bSearchable_'.$i] == "true" && $_GET['sSearch_'.$i] != '' )
        {
            if ( $sWhere == "" )
            {
                $sWhere = "WHERE ";
            }
            else
            {
                $sWhere .= " AND ";
            }
            $sWhere .= $aColumns[$i]." LIKE '%".mysql_real_escape_string($_GET['sSearch_'.$i])."%' ";
        }
    }
     
     
    /*
     * SQL queries
     * Get data to display
     */
    $sQuery = "
        SELECT SQL_CALC_FOUND_ROWS ".str_replace(" , ", " ", implode(", ", $aColumns))."
        FROM   $sTable
        $sWhere
        $sOrder
        $sLimit
    ";
    $rResult = mysql_query( $sQuery, $gaSql['link'] ) or fatal_error( 'MySQL Error: ' . mysql_errno() );
     
    /* Data set length after filtering */
    $sQuery = "
        SELECT FOUND_ROWS()
    ";
    $rResultFilterTotal = mysql_query( $sQuery, $gaSql['link'] ) or fatal_error( 'MySQL Error: ' . mysql_errno() );
    $aResultFilterTotal = mysql_fetch_array($rResultFilterTotal);
    $iFilteredTotal = $aResultFilterTotal[0];
     
    /* Total data set length */
    $sQuery = "
        SELECT COUNT(".$sIndexColumn.")
        FROM   $sTable
    ";
    $rResultTotal = mysql_query( $sQuery, $gaSql['link'] ) or fatal_error( 'MySQL Error: ' . mysql_errno() );
    $aResultTotal = mysql_fetch_array($rResultTotal);
    $iTotal = $aResultTotal[0];
     
     
    /*
     * Output
     */
    $sOutput = '{';
    $sOutput .= '"sEcho": '.intval($_GET['sEcho']).', ';
    $sOutput .= '"iTotalRecords": '.$iTotal.', ';
    $sOutput .= '"iTotalDisplayRecords": '.$iFilteredTotal.', ';
    $sOutput .= '"aaData": [ ';
    while ( $aRow = mysql_fetch_array( $rResult ) )
    {
        $sOutput .= "[";
        for ( $i=0 ; $i<count($aColumns) ; $i++ )
        {
            if ( $aColumns[$i] == "version" )
            {
                /* Special output formatting for 'version' */
                $sOutput .= ($aRow[ $aColumns[$i] ]=="0") ?
                    '"-",' :
                    '"'.str_replace('"', '\"', $aRow[ $aColumns[$i] ]).'",';
            }
            else if ( $aColumns[$i] != ' ' )
            {
                /* General output */
                $sOutput .= '"'.str_replace(
                    array( '"', "\n", "\r" ),
                    array( '\\"', "\\n", "\\n"),
                    $aRow[ $aColumns[$i] ] ).'",';
            }
        }
         
        /*
         * Optional Configuration:
         * If you need to add any extra columns (add/edit/delete etc) to the table, that aren't in the
         * database - you can do it here
         */
         
         
        $sOutput = substr_replace( $sOutput, "", -1 );
        $sOutput .= "],";
    }
    $sOutput = substr_replace( $sOutput, "", -1 );
    $sOutput .= '] }';
      
       echo $sOutput;
?>