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.Categories.ProductCategoryFieldValueService.GetCategoryValue(Product product, String categoryId, String fieldId, Boolean includeInheritance)
   at Dynamicweb.Ecommerce.Products.Categories.ProductCategoryFieldValueService.GetProductCategoryFieldValue(Product product, String categoryId, Field field)
   at Dynamicweb.Ecommerce.Frontend.Renderer.RenderProductCategoryFields(Product product, Category category, Template template, String loopName, Lazy`1 categoryFieldSortings)
   at Dynamicweb.Ecommerce.Frontend.Renderer.RenderProductCategories(Product product, Template template, String loopName, Lazy`1 categoryFieldSortings, 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.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)