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

System.Exception: fieldId cannot be null or empty
   at Dynamicweb.Core.Ensure.That[TException](Boolean condition, String message)
   at Dynamicweb.Ecommerce.ProductCategoryFieldService.GetFieldById(String categoryId, String fieldId, String languageId)
   at Dynamicweb.Ecommerce.Products.ProductField.get_CachedCategoryFields()
   at Dynamicweb.Ecommerce.Products.ProductField.GetCategoryFields()
   at Dynamicweb.Ecommerce.Products.ProductField.GetAllEditableProductFields()
   at Dynamicweb.Ecommerce.Products.FieldDisplayGroups.FieldDisplayGroupService.GetDisplayGroupsFields()
   at System.Lazy`1.CreateValue()
   at System.Lazy`1.LazyInitValue()
   at Dynamicweb.Ecommerce.Frontend.Renderer.RenderFieldDisplayGroups(Product product, PriceInfo productPrice, Template fieldDisplayGroupsTemplate, RenderingContext renderingContext)
   at Dynamicweb.Ecommerce.Frontend.Renderer.RenderProduct(Product product, Boolean extendedProperties, Template template, Int32 loopCounter, Boolean renderRelated, String productUrl, Int32 quantity, Int32 wishListId, Boolean renderPublicList, Boolean isRecursiveCall, Lazy`1 categoryFieldSorting, Int32 orderLineOfProductCount, RenderingContext renderingContext, String unitId)
   at Dynamicweb.Ecommerce.Frontend.Renderer.RenderProducts(ProductCollection products, Template parentTemplate, String loopName, Int32 loopCounter, Boolean renderRelatedProducts, Boolean renderRelatedLists, Boolean isRecursive, RenderingContext renderingContext)
   at Dynamicweb.Ecommerce.Frontend.Renderer.RenderProductRelatedGroups(RenderingContext renderingContext, 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, Boolean isRecursiveCall, Lazy`1 categoryFieldSorting, Int32 orderLineOfProductCount, RenderingContext renderingContext, String unitId)
   at Dynamicweb.Ecommerce.Frontend.Renderer.RenderProduct(Product product, Boolean extendedProperties, String unitId)
   at Dynamicweb.Ecommerce.Frontend.Frontend.EcomRender()
   at Dynamicweb.Ecommerce.Frontend.Frontend.GetContent()
   at Dynamicweb.Frontend.Content.GetModuleOutput(Paragraph paragraph, PageView pageview)