Class "JDispatcher" not found

-- HikaShop version -- : 5.0.3
-- Joomla version -- : 4.4
-- PHP version -- : 8.1.27
-- Browser(s) name and version -- : firefox
-- Error-message(debug-mod must be tuned on) -- : The requested page can't be found.

on checkout get to hitting "finish" button then get error page : the requested page could not be found with error

0 Class "JDispatcher" not found

Call stack
# Function Location
1 () JROOT/media/com_hikashop/mail/order_creation_notification.preload.modified.php:438

code at this point is

JPluginHelper::importPlugin('hikashop');
$dispatcher = JDispatcher::getInstance();
$dispatcher->trigger('onAfterOrderProductsListingDisplay', array(&$data->cart, 'email_notification_html'));

please could you advise of a solution