- Ensure that the option "Create Labels/Temporary Group Using:" (see here) is NOT set to "I am NOT outputting to Labels or Groups"
- Ensure Output Type is set to Temporary Group
Updated
<% if (previousArticle) { %>
<% } %>
<% if (allItems.length > 1) { %>
<% if (previousTitle) { %>
<% } %>
<% if (nextArticle) { %>
<%= previousTitle %>
<% } %> <%= previousArticle.title %>
<% if (nextTitle) { %>
<% } %>