This template has been installed under the following environment as a pure template (not as Quickstart Pack Joomla 4): Joomla 5.0.2 Php 8.3

Is this a bug or have I overlooked something: When I try to call up the options of the Tempaltes "Fusion" I immediately get an error 500.

The debugger message:

Attempted to call an undefined method named "sanitizeAssetsForJ5" of class "PlgSystemHelixultimate".

Symfony\Component\ErrorHandler\Error\

UndefinedMethodError in /usr/www/users/vincor/cms/plugins/system/helixultimate/helixultimate.php (line 393) PlgSystemHelixultimate->onBeforeCompileHead() in /usr/www/users/vincor/cms/libraries/src/Plugin/CMSPlugin.php (line 289) in /usr/www/users/vincor/cms/libraries/vendor/joomla/event/src/Dispatcher.php -> Joomla\CMS\Plugin{closure} (line 454) Dispatcher->dispatch() in /usr/www/users/vincor/cms/libraries/src/Document/Renderer/Html/MetasRenderer.php (line 62) MetasRenderer->render() in /usr/www/users/vincor/cms/libraries/src/Document/HtmlDocument.php (line 575) HtmlDocument->getBuffer() in /usr/www/users/vincor/cms/libraries/src/Document/HtmlDocument.php (line 894) HtmlDocument->_renderTemplate() in /usr/www/users/vincor/cms/libraries/src/Document/HtmlDocument.php (line 647) HtmlDocument->render() in /usr/www/users/vincor/cms/libraries/src/Document/ErrorDocument.php (line 139) ErrorDocument->render() in /usr/www/users/vincor/cms/libraries/src/Error/Renderer/HtmlRenderer.php (line 70) HtmlRenderer->render() in /usr/www/users/vincor/cms/libraries/src/Exception/ExceptionHandler.php (line 136) ExceptionHandler::render() in /usr/www/users/vincor/cms/libraries/src/Exception/ExceptionHandler.php (line 73) ExceptionHandler::handleException() in /usr/www/users/vincor/cms/libraries/src/Application/CMSApplication.php (line 336) CMSApplication->execute() in /usr/www/users/vincor/cms/administrator/includes/app.php (line 58) require_once('/usr/www/users/vincor/cms/administrator/includes/app.php') in /usr/www/users/vincor/cms/administrator/index.php (line 32) Error

Call to undefined method PlgSystemHelixultimate::sanitizeAssetsForJ5()

in /usr/www/users/vincor/cms/plugins/system/helixultimate/helixultimate.php (line 393) PlgSystemHelixultimate->onBeforeCompileHead() in /usr/www/users/vincor/cms/libraries/src/Plugin/CMSPlugin.php (line 289) in /usr/www/users/vincor/cms/libraries/vendor/joomla/event/src/Dispatcher.php -> Joomla\CMS\Plugin{closure} (line 454) Dispatcher->dispatch() in /usr/www/users/vincor/cms/libraries/src/Document/Renderer/Html/MetasRenderer.php (line 62) MetasRenderer->render() in /usr/www/users/vincor/cms/libraries/src/Document/HtmlDocument.php (line 575) HtmlDocument->getBuffer() in /usr/www/users/vincor/cms/libraries/src/Document/HtmlDocument.php (line 894) HtmlDocument->_renderTemplate() in /usr/www/users/vincor/cms/libraries/src/Document/HtmlDocument.php (line 647) HtmlDocument->render() in /usr/www/users/vincor/cms/libraries/src/Application/CMSApplication.php (line 1073) CMSApplication->render() in /usr/www/users/vincor/cms/libraries/src/Application/AdministratorApplication.php (line 434) AdministratorApplication->render() in /usr/www/users/vincor/cms/libraries/src/Application/CMSApplication.php (line 311) CMSApplication->execute() in /usr/www/users/vincor/cms/administrator/includes/app.php (line 58) require_once('/usr/www/users/vincor/cms/administrator/includes/app.php') in /usr/www/users/vincor/cms/administrator/index.php (line 32)

Thanks in Advance