Update user-preferences.html.twig

modules/user_preferences/templates/user-preferences.html.twig

@@ -50,7 +50,7 @@
       </span>
       {% if is_book %}
         {% if can_add_child_page %}
-          <span class="addpage nav-link"><a href="/statprogram/node/add/lesson?parent={{ nid }}" id="add_child_page"
+          <span class="addpage nav-link"><a href="{{ url('<front>')|render ~ 'node/add/lesson?parent=' ~ nid }}" id="add_child_page"
           data-tippy-content="Add child page" data-toggle="tooltip" aria-label="Add child page">
             <span class="fa-layers">
               <i class="fal fa-book">&nbsp;</i>