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

System.ArgumentNullException: Value cannot be null.
Parameter name: s
   at System.IO.StringReader..ctor(String s)
   at PicoServices.PicoWrapper.CommonTasks.GetSelectsFiltersFiltered(XElement XML, String IDS)
   at PicoServices.PicoWrapper.PWMainTasks.GetFilterXML(String consql, String conn, String IDS, String Guid, String lang)
   at PicoPublish.CustomModules.Extensibility.ProductListTemplateExtender1.RenderFeatureListNew(Template template)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderProductListTemplateExtenders(ProductCollection ProductList, Template Template)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderProducts(ProductCollection Products, Template ParentTemplate, String LoopName, Int32 LoopCounter, Boolean renderRelatedProducts, Boolean renderRelatedLists)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderProducts(ProductCollection Products)
   at Dynamicweb.eCommerce.Frontend.Frontend.ListProducts(ProductCollection products, String groupsIdent, Boolean hasBeenSorted)
   at Dynamicweb.eCommerce.Frontend.Frontend.List(String groups)
   at Dynamicweb.eCommerce.Frontend.Frontend.EcomRender()
   at Dynamicweb.eCommerce.Frontend.Frontend.GetContent()
   at Dynamicweb.Frontend.Content.GetModule(DataRow& ParagraphRow)