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.ProductGroupRelation.GetCachedProductGroupRelations(String productId)
   at Dynamicweb.eCommerce.Products.ProductGroupRelation.GetCachedProductGroupRelations(Product product)
   at Dynamicweb.eCommerce.Products.Product.GetCategories()
   at Dynamicweb.eCommerce.Products.Categories.Category.FillValues(Product product)
   at Dynamicweb.eCommerce.Products.Product.GetProductCategoryFieldValue(String productId, String variantId, String languageId, Field field)
   at Dynamicweb.eCommerce.Products.Product.GetCategoryValue(String productId, String variantId, String languageId, String defaultLanguageId, IEnumerable`1 groupIds, String primaryGroupId, Func`5 getProdFieldVal, Func`4 getGroupFieldVal, Field catField, Boolean includeInheritance)
   at Dynamicweb.eCommerce.Products.Product.GetCategoryValue(String categoryID, String fieldID, Boolean includeInheritance)
   at Dynamicweb.eCommerce.Frontend.Renderer.GetProductCategoryFieldValue(Product product, String categoryID, Field field)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderProductCategories(Product product, Template template, String loopName)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderProduct(Product Product, Boolean ExtendedProperties, Template Template, Int32 loopCounter, Boolean renderRelated, String productURL, Int32 quantity, Int32 wishListID, Boolean renderPublicList, Int32 orderLineOfProductCount)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderVariantCombinations(Product product, Template ParentTemplate, String LoopName)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderProduct(Product Product, Boolean ExtendedProperties, Template Template, Int32 loopCounter, Boolean renderRelated, String productURL, Int32 quantity, Int32 wishListID, Boolean renderPublicList, Int32 orderLineOfProductCount)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderProduct(Product Product, Boolean ExtendedProperties)
   at Dynamicweb.eCommerce.Frontend.Frontend.RenderProduct(Product prod)
   at Dynamicweb.eCommerce.Frontend.Frontend.EcomRender()
   at Dynamicweb.eCommerce.Frontend.Frontend.GetContent()
   at Dynamicweb.Frontend.Content.GetModule(DataRow& ParagraphRow)
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