internal server error 500 after click confirm button on checkout page

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<?xml version="1.0" encoding="UTF-8"?>
<modification>
    <id>debug_checkout</id>
    <version>1.0</version>
    <vqmver>2.6.1</vqmver>
    <author>Your Name</author>
    
    
    <!-- Adding debug logs in confirm.php -->
    <file name="catalog/controller/checkout/confirm.php">
        <operation>
            <search><![CDATA[<?php]]></search>
            <add position="after"><![CDATA[
error_log('Reached confirm.php');
            ]]></add>
        </operation>
        <operation>
            <search><![CDATA[$this->model_checkout_order->addOrder($order_data);]]></search>
            <add position="after"><![CDATA[
error_log('Order data: ' . print_r($order_data, true));
            ]]></add>
        </operation>
        <operation>
            <search><![CDATA[$this->response->redirect($this->url->link('checkout/success'));]]></search>
            <add position="before"><![CDATA[
error_log('Order ID: ' . $order_id);
            ]]></add>
        </operation>
    </file>
    
    <!-- Adding debug logs in order.php -->
    <file name="catalog/model/checkout/order.php">
        <operation>
            <search><![CDATA[public function addOrder($data) {]]></search>
            <add position="after"><![CDATA[
error_log('Entered addOrder method');
        ]]></add>
        </operation>
        <operation>
            <search><![CDATA[return $order_id;]]></search>
            <add position="before"><![CDATA[
error_log('Order ID to be returned: ' . $order_id);
        ]]></add>
        </operation>
    </file>
    
    <!-- Adding debug logs in success.php -->
    <file name="catalog/controller/checkout/success.php">
        <operation>
            <search><![CDATA[<?php]]></search>
            <add position="after"><![CDATA[
error_log('Reached success.php');
            ]]></add>
        </operation>
        <operation>
            <search><![CDATA[$this->document->setTitle($this->language->get('heading_title'));]]></search>
            <add position="before"><![CDATA[
error_log('Setting document title');
            ]]></add>
        </operation>
        <operation>
            <search><![CDATA[$data['breadcrumbs'] = array();]]></search>
            <add position="after"><![CDATA[
error_log('Initializing breadcrumbs');
            ]]></add>
        </operation>
        <operation>
            <search><![CDATA[$data['continue'] = $this->url->link('common/home');]]></search>
            <add position="before"><![CDATA[
error_log('Setting continue link');
            ]]></add>
        </operation>
    </file>
</modification>

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<?php

// Version
define('VERSION', '2.3.0.2');

// Configuration
if (is_file('config.php')) {
	require_once('config.php');
}

// Install
if (!defined('DIR_APPLICATION')) {
	header('Location: install/index.php');
	exit;
}

// VirtualQMOD
require_once('./vqmod/vqmod.php');
VQMod::bootup();

// VQMODDED Startup
require_once(VQMod::modCheck(DIR_SYSTEM . 'startup.php'));

start('catalog');

Code: Select all

<?php
// HTTP
define('HTTP_SERVER', 'http://domain.com/');

// HTTPS
define('HTTPS_SERVER', 'https://domain.com/');

// DIR
define('DIR_APPLICATION', '/home/demo/public_html/catalog/');
define('DIR_SYSTEM', '/home/demo/public_html/system/');
define('DIR_LANGUAGE', '/home/demo/public_html/catalog/language/');
define('DIR_TEMPLATE', '/home/demo/public_html/catalog/view/theme/');
define('DIR_CONFIG', '/home/demo/public_html/system/config/');
define('DIR_IMAGE', '/home/demo/public_html/image/');
define('DIR_CACHE', '/home/demo/public_html/system/storage/cache/');
define('DIR_DOWNLOAD', '/home/demo/public_html/system/storage/download/');
define('DIR_LOGS', '/home/demo/public_html/system/storage/logs/');
define('DIR_MODIFICATION', '/home/demo/public_html/system/storage/modification/');
define('DIR_UPLOAD', '/home/demo/public_html/system/storage/upload/');

//Sam
define('ERROR_DISPLAY', true);
define('ERROR_LOG', true);
define('ERROR_FILENAME', 'error.log');

// DB
define('DB_DRIVER', 'mysqli');
define('DB_HOSTNAME', 'localhost');
define('DB_USERNAME', 'xxxxx');
define('DB_PASSWORD', '^xxxxx');
define('DB_DATABASE', 'xxxxx');
define('DB_PORT', '3306');
define('DB_PREFIX', 'oc_');