newsupernova/app/code/Mageplaza/Core/etc/adminhtml/routes.xml

<?xml version="1.0"?>
<!--
/**
 * Mageplaza
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Mageplaza.com license that is
 * available through the world-wide-web at this URL:
 * https://www.mageplaza.com/LICENSE.txt
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade this extension to newer
 * version in the future.
 *
 * @category    Mageplaza
 * @package     Mageplaza_Core
 * @copyright   Copyright (c) 2016-2018 Mageplaza (http://www.mageplaza.com/)
 * @license     https://www.mageplaza.com/LICENSE.txt
 */
 -->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/etc/routes.xsd">
    <router id="admin">
        <route id="mageplaza_core" frontName="mageplaza_core">
            <module name="Mageplaza_Core" before="Magento_Backend"/>
        </route>
    </router>
</config>