Notice: Undefined index: title in /vendor/magento/module-integration/Helper/Data.php on line 24

- I have read few articles and came to know that it is due to missing title in any of the modules acl.xml

- Go to your freshly created modules (some modules which you created last or before), open app/code/Name_Space/Module_Name/etc/acl.xml

 <?xml version="1.0" ?>  
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Acl/etc/acl.xsd">  
 <acl>  
   <resources>  
     <resource id="Magento_Backend::admin">  
       <resource id="Magento_Backend::stores">  
         <resource id="Magento_Backend::stores_settings">  
           <resource id="Magento_Config::config">  
             <resource id="Namespace_Modulename::config_namespace_modulename" title="Put Here the Title"/>  
           </resource>  
         </resource>  
       </resource>  
     </resource>  
   </resources>  
 </acl>  
 </config>