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

System.NullReferenceException: Object reference not set to an instance of an object.
   at Dynamicweb.eCommerce.Products.Group.get_AllGroupsByLanguageID(String languageID)
   at Dynamicweb.eCommerce.Products.Group.get_Subgroups()
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderGroup(Group Group, Template Template, Boolean renderSubGroups)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderGroups(GroupCollection Groups, Template ParentTemplate, String LoopName)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderGroup(Group Group, Template Template, Boolean renderSubGroups)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderGroups(GroupCollection Groups, Template ParentTemplate, String LoopName)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderGroup(Group Group, Template Template, Boolean renderSubGroups)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderGroups(GroupCollection Groups, Template ParentTemplate, String LoopName)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderGroups(GroupCollection Groups)
   at Dynamicweb.eCommerce.Frontend.Frontend.EcomRender()
   at Dynamicweb.eCommerce.Frontend.Frontend.GetContent()
   at Dynamicweb.Frontend.Content.GetModule(DataRow& ParagraphRow)

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