etc/adminhtml/routes.xml
<?xml version="1.0"?>
<!--
/**
* Copyright © EAdesign by Eco Active S.R.L.,All rights reserved.
* See LICENSE for license details.
*/
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/etc/routes.xsd">
<router id="admin">
<route id="pdfgenerator" frontName="pdfgenerator">
<module name="Eadesigndev_Pdfgenerator" before="Magento_Backend"/>
</route>
</router>
</config>