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.Categories.Category.GetCategoryByID(String categoryID, String languageID)
   at Dynamicweb.eCommerce.Products.Categories.Field.CachedFields()
   at Dynamicweb.eCommerce.Products.Categories.Field.GetFieldsByCategoryId(String categoryId, String languageId)
   at Dynamicweb.eCommerce.Products.Product.GetCategoryValue(String categoryID, String fieldID, Boolean includeInheritance)
   at Co3.Espresso.Dw8.Extenders.Products.ProductConfiguratorExtender.GetCategoryValue(Product product, String sysName) in C:\Data\Development\git\espresso-solution\Co3.Espresso.Dynamicweb8\Extenders\Products\ProductConfiguratorExtender.cs:line 135
   at Co3.Espresso.Dw8.Extenders.Products.ProductConfiguratorExtender.GenerateSectionsData(ProductConfigurationEntity& pce, Template& template, Product product) in C:\Data\Development\git\espresso-solution\Co3.Espresso.Dynamicweb8\Extenders\Products\ProductConfiguratorExtender.cs:line 98
   at Co3.Espresso.Dw8.Extenders.Products.ProductConfiguratorExtender.ExtendTemplate(Template template, ProductTemplateExtender extender, CacheEngine cacheEngine) in C:\Data\Development\git\espresso-solution\Co3.Espresso.Dynamicweb8\Extenders\Products\ProductConfiguratorExtender.cs:line 170
   at Co3.Espresso.Dw8.Extenders.ProductExtender.ExtendTemplate(Template template) in C:\Data\Development\git\espresso-solution\Co3.Espresso.Dynamicweb8\Extenders\ProductExtender.cs:line 97
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderProductTemplateExtenders(Product Product, Template Template, Boolean ExtendedProperties)
   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)