Just change the port to 8081 and following virtual host will work:
<VirtualHost *:8081>ServerName comm-app.localDocumentRoot "C:/xampp/htdocs/CommunicationApp/public"SetEnv APPLICATION_ENV "development"<Directory "C:/xampp/htdocs/CommunicationApp/public"> DirectoryIndex index.php AllowOverride All Order allow,deny Allow from all</Directory> </VirtualHost>