```ruby
module ProjectsHelper

  def render_project_hierarchy(projects)
    s = ''
    if projects.any?
      ancestors = []
      original_project = @project
      projects.each do |project|
        # set the project environment to please macros.
        @project = project
        if (ancestors.empty? || project.is_descendant_of?(ancestors.last))
          s << "<ul class='projects #{ ancestors.empty? ? 'root' : nil}'>\n"
        else
          ancestors.pop
          s << "</li>"
          while (ancestors.any? && !project.is_descendant_of?(ancestors.last)) 
            ancestors.pop
            s << "</ul></li>\n"
          end
        end
        classes = (ancestors.empty? ? 'root' : 'child')
        s << "<li class='#{classes}'><div class='#{classes}'>" +
               link_to_project(project, {:action => 'issues'}, :class => "project #{User.current.member_of?(project) ? 'my-project' : nil}")
        s << "<div class='wiki description'>#{textilizable(project.short_description, :project => project)}</div>" unless project.description.blank?
        s << "</div>\n"
        ancestors << project
      end
      s << ("</li></ul>\n" * ancestors.size)
      @project = original_project
    end
    s
  end
```

Resolve syntax error: include missing END.
user
```ruby
module ProjectsHelper

  def render_project_hierarchy(projects)
    s = ''
    if projects.any?
      ancestors = []
      original_project = @project
      projects.each do |project|
        # set the project environment to please macros.
        @project = project
        if (ancestors.empty? || project.is_descendant_of?(ancestors.last))
          s << "<ul class='projects #{ ancestors.empty? ? 'root' : nil}'>\n"
        else
          ancestors.pop
          s << "</li>"
          while (ancestors.any? && !project.is_descendant_of?(ancestors.last)) 
            ancestors.pop
            s << "</ul></li>\n"
          end
        end
        classes = (ancestors.empty? ? 'root' : 'child')
        s << "<li class='#{classes}'><div class='#{classes}'>" +
               link_to_project(project, {:action => 'issues'}, :class => "project #{User.current.member_of?(project) ? 'my-project' : nil}")
        s << "<div class='wiki description'>#{textilizable(project.short_description, :project => project)}</div>" unless project.description.blank?
        s << "</div>\n"
        ancestors << project
      end
      s << ("</li></ul>\n" * ancestors.size)
      @project = original_project
    end
    s
  end

end
```
assistant