How can i fix X-cart product page ? Product page is blank - x-cart

Question

I have x-cart site which is running from 4 years and suddenly product page is not working. we have not done any changes.
X-Cart DB Version: 4.1.9 GOLD
product page url : https://www.test.com/product.php?productid=40&cat=0&page=1&featured
I can see bellow error in log file "x-errors_php-190521.php"
PHP Fatal error:
Call to undefined function func_get_categories_list() in public_html/include/common.php on line 76
if (
!isset($cat)
|| $config['Appearance']['root_categories'] == 'Y'
) {
$categories = func_get_categories_list(0, false);
} else {
Line No 76: =>>> $categories = func_get_categories_list($cat, false);
}
so help us to solve this issue

Answer 1

1) Try to add the
x_load('category');
in the include/common.php right after the
case 'C':
line
2) Try to compare your product.php with the default one and localize the problem.
3) Try to compare your include/common.php with the default one and localize the problem.
4) Try to compare your include/categories.php with the default one and localize the problem.
5) Try to move x_load('category'); before the code switch ($current_area) {
6) Try to add the code include_once $xcart_dir . '/include/func/func.category.php'; before the code switch ($current_area) {
Key notes:
include/common.php was added in X-Cart 4.4.0
The func_get_categories_list function is defined in
include/categories.php file in X-Cart 4.1.9
The func_get_categories_list function is defined in
include/func/func.category.php file in X-Cart 4.4.0
It will be helpful to define the exact version of your files for that compare
files like include/func/func.core.php cart.php include/func/func.category.php include/func/func.order.php with the default ones.