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

System.ArgumentNullException: Value cannot be null.
Parameter name: product
   at Boxx.Web.CustomModules.Guru.Frontend.GetAppBuilderSite(Product product)
   at Boxx.Web.CustomModules.Guru.Frontend.RenderFrontend()
   at Boxx.Web.CustomModules.Guru.Frontend.GetContent()
   at Dynamicweb.Frontend.Content.GetModule(DataRow& ParagraphRow)