Magento – System Error/Success messages are not displaying in custom theme

I have faced issue related to display message in Magento2 Beta source. In some source by default display error and success message but in some case it do not display then follow below steps.

Step 1: I have created Message.php file in my custom module in Darsh\Crud\Block\Message.php

namespace Darsh\Crud\Block;

class Message extends \Magento\Framework\View\Element\Messages {

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Framework\Message\Factory $messageFactory,
        \Magento\Framework\Message\CollectionFactory $collectionFactory,
        \Magento\Framework\Message\ManagerInterface $messageManager,       
        array $data = []
    ) {
        parent::__construct(
            $context,
            $messageFactory,
            $collectionFactory,
            $messageManager,
            $data
        );       
    }

    protected function _prepareLayout()
    {
        $this->addMessages($this->messageManager->getMessages(true));       
        return parent::_prepareLayout();
    }

}

Step 2: Added message block in to handeler in Darsh\Crud\view\frontend\layout\crud_index_form.xml

   <referenceContainer name="page.messages">
        <block class="Darsh\Crud\Block\Message" name="darsh.crud.message" />
    </referenceContainer>

Please add opening and closing Tag <> for layout handle.

Now you can see your custom message added in Darsh\Crud\Controller\Index\Form.

If you face any issue please see Example module on https://github.com/Darshanmodi1427/Magento2_Crud_Operation.git

For me this issue was being caused by the message block not being present on the page. Try loading other pages that you have modified less.