Design.php

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<?php
namespace Magento\Framework\App\Action\Plugin;

use Magento\Framework\Message\MessageInterface;

class Design
{
    protected $_designLoader;

    protected $messageManager;

    public function __construct(
        \Magento\Framework\View\DesignLoader $designLoader,
        \Magento\Framework\Message\ManagerInterface $messageManager
    ) {
        $this->_designLoader = $designLoader;
        $this->messageManager = $messageManager;
    }

    public function beforeDispatch(
        \Magento\Framework\App\ActionInterface $subject,
        \Magento\Framework\App\RequestInterface $request
    ) {
        try {
            $this->_designLoader->load();
        } catch (\Magento\Framework\Exception\LocalizedException $e) {
            if ($e->getPrevious() instanceof \Magento\Framework\Config\Dom\ValidationException) {
                $message = $this->messageManager
                    ->createMessage(MessageInterface::TYPE_ERROR)
                    ->setText($e->getMessage());
                $this->messageManager->addUniqueMessages([$message]);
            }
        }
    }
}