Error message at checkout page

-- url of the page with the problem -- : www.ericspeanuts.com
-- HikaShop version -- : 4.6.2
-- Joomla version -- : 4.2.5
-- PHP version -- : 8
-- Browser(s) name and version -- : Version 107.0.5304.107 , edge
-- Error-message(debug-mod must be tuned on) -- : CALL TO UNDEFINED METHOD JOOMLA\CMS\APPLICATION\SITEAPPLICATION::ISADMIN()

HOME PAGE
Call stack
# Function Location
1 () JROOT\plugins\hikashoppayment\alphauserpoints\alphauserpoints.php:761
2 plgHikashoppaymentAlphauserpoints->onAfterOrderCreate() JROOT\libraries\src\Plugin\CMSPlugin.php:279
3 Joomla\CMS\Plugin\CMSPlugin->Joomla\CMS\Plugin\{closure}() JROOT\libraries\vendor\joomla\event\src\Dispatcher.php:486
4 Joomla\Event\Dispatcher->dispatch() JROOT\libraries\src\Application\EventAware.php:107
5 Joomla\CMS\Application\WebApplication->triggerEvent() JROOT\administrator\components\com_hikashop\classes\order.php:435
6 hikashopOrderClass->save() JROOT\administrator\components\com_hikashop\classes\order.php:906
7 hikashopOrderClass->createFromCart() JROOT\components\com_hikashop\controllers\checkout.php:671
8 checkoutController->confirm() JROOT\libraries\src\MVC\Controller\BaseController.php:672
9 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT\administrator\components\com_hikashop\helpers\helper.php:2402
10 hikashopController->execute() JROOT\components\com_hikashop\hikashop.php:88
11 require_once() JROOT\libraries\src\Dispatcher\LegacyComponentDispatcher.php:71
12 Joomla\CMS\Dispatcher\LegacyComponentDispatcher::Joomla\CMS\Dispatcher\{closure}() JROOT\libraries\src\Dispatcher\LegacyComponentDispatcher.php:73
13 Joomla\CMS\Dispatcher\LegacyComponentDispatcher->dispatch() JROOT\libraries\src\Component\ComponentHelper.php:355
14 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT\libraries\src\Application\SiteApplication.php:200
15 Joomla\CMS\Application\SiteApplication->dispatch() JROOT\libraries\src\Application\SiteApplication.php:241
16 Joomla\CMS\Application\SiteApplication->doExecute() JROOT\libraries\src\Application\CMSApplication.php:294
17 Joomla\CMS\Application\CMSApplication->execute() JROOT\includes\app.php:61
18 require_once() JROOT\index.php:32

I upgrade my site to Joomla 4.2.5. All extensions were upgraded.
All is working only I get the error message bellow on the Hikashop checkout page.

Can you please help out.

Thank you in advance,

Eric Ware

Hi,

You need to disable or uninstall the "alphauserpoints" plugin in the Joomla plugins manager.
That plugin has not been included in HikaShop for many years and thus you have a really old version which isn't compatible with Joomla 4.

Ok thank you, I disabled it, and it works. How can I uninstall it? I delete the plugin folder in plugins/hikashoppayment/alphauserpoints?

No. To uninstall an extension you need to go in the Joomla extensions manager, select the extension and click on the uninstall button.