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.GroupShopRelation.get_GroupShopRelationByGroupID(String groupID)
   at Dynamicweb.eCommerce.Products.Group.get_ShopID()
   at Dynamicweb.eCommerce.Products.Group.get_CachedGroups()
   at Dynamicweb.eCommerce.Products.Group.get_AllGroupsByLanguageIDAndShopID(String languageID, String shopID)
   at Dynamicweb.eCommerce.Shops.Shop.get_Groups()
   at Dynamicweb.eCommerce.Frontend.ProductCatalogSettings.get_Groups()
   at Dynamicweb.eCommerce.Frontend.Frontend.EcomRender()
   at Dynamicweb.eCommerce.Frontend.Frontend.GetContent()
   at Dynamicweb.Frontend.Content.GetModule(DataRow& ParagraphRow)
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