Thank you for your help, Jeremy. Unfortunately this didn’t work for me, as I don’t see a menu id at the end of the URL.
What I ended up doing and what worked was changing line 35 in Minileven’s header.php. I replaced the lower case “menu” with “Menu”:
wp_nav_menu( array( 'theme_location' => 'primary', 'container_class' => '', 'menu_class' => 'nav-menu', 'Menu' => $menu_id ) );
