Hi,

Can you please help me? I am trying to update site alcentrum.com from Joomla 5.4.7 to Joomla 6, but when updated the decora template to 2.0.3 and then clicked on link to disable the compatibility plugin on J6 update screen the whole site & admin crashed. I had to enable the plugin via db to make it run again.

Here is the error reporting and debug message:

Error ClassNotFoundError HTTP 500 Whoops, looks like something went wrong. Attempted to load class "Helper" from namespace "HelixUltimate\Framework\Platform". Did you forget a "use" statement for another namespace? Symfony\Component\ErrorHandler\Error\ ClassNotFoundError in /web/alcentrum.com/templates/decora/error.php (line 18)

use Joomla\CMS\HTML\HTMLHelper;
use Joomla\CMS\Language\Text;
$app = Factory::getApplication();
$doc = Factory::getDocument();
$template = HelixUltimate\Framework\Platform\Helper::loadTemplateData();
$params = $template->params;
$theme_url = Uri::base(true) . '/templates/'. $this->template;
?>

require() in /web/alcentrum.com/libraries/src/Document/HtmlDocument.php (line 734) HtmlDocument->_loadTemplate() in /web/alcentrum.com/libraries/src/Document/HtmlDocument.php (line 788) HtmlDocument->_fetchTemplate() in /web/alcentrum.com/libraries/src/Document/HtmlDocument.php (line 625) HtmlDocument->parse() in /web/alcentrum.com/libraries/src/Document/HtmlDocument.php (line 643) HtmlDocument->render() in /web/alcentrum.com/libraries/src/Document/ErrorDocument.php (line 139) ErrorDocument->render() in /web/alcentrum.com/libraries/src/Error/Renderer/HtmlRenderer.php (line 70) HtmlRenderer->render() in /web/alcentrum.com/libraries/src/Exception/ExceptionHandler.php (line 142) ExceptionHandler::render() in /web/alcentrum.com/libraries/src/Exception/ExceptionHandler.php (line 76) ExceptionHandler::handleException() in /web/alcentrum.com/libraries/src/Application/CMSApplication.php (line 334) CMSApplication->execute() in /web/alcentrum.com/includes/app.php (line 58) require_once('/web/alcentrum.com/includes/app.php') in /web/alcentrum.com/index.php (line 51) Error

Class "JPlugin" not found