An error occurred while attaching module (Dynamicweb.Frontend.Content)

System.Exception: Empty template: Maps/templates/Maps-sorting-Alter-G-TEST.html
   at Dynamicweb.Maps.Maps.Render(StringBuilder content)
   at Dynamicweb.Maps.Maps.GetContent()
   at Dynamicweb.Frontend.Content.GetModuleOutput(Paragraph paragraph, PageView pageview)