Products

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

System.ArgumentNullException: Value cannot be null.
Parameter name: source
   at System.Linq.Enumerable.Contains[TSource](IEnumerable`1 source, TSource value, IEqualityComparer`1 comparer)
   at Dynamicweb.Content.Caching.Storage.Contains(String key)
   at Dynamicweb.eCommerce.Products.Categories.Category.get_CachedCategories()
   at Dynamicweb.eCommerce.Products.Categories.Category.GetCategoryByID(String categoryID, String languageID)
   at Dynamicweb.eCommerce.Products.Group.Fill(IDataReader DataReader)
   at Dynamicweb.eCommerce.Products.Group.get_CachedGroups()
   at Dynamicweb.eCommerce.Products.Group.get_AllGroupsByLanguageID(String languageID)
   at Dynamicweb.eCommerce.Products.Group.get_GroupByID(String groupID, String languageId, String defaultLanguageId)
   at Dynamicweb.eCommerce.Products.Group.GetGroupsByIDs(IEnumerable`1 groupIDs, Boolean applyFiltering, String languageId, String defaultLanguageId)
   at Dynamicweb.eCommerce.Frontend.Frontend.EcomRender()
   at Dynamicweb.eCommerce.Frontend.Frontend.GetContent()
   at Dynamicweb.Frontend.Content.GetModule(DataRow& ParagraphRow)