SMETS1 Consultation on changes to the SMETS1 Supporting Requirements

System.NullReferenceException: Object reference not set to an instance of an object.
   at Umbraco.Cms.Core.Models.PublishedContent.PublishedContentType..ctor(IContentTypeComposition contentType, IPublishedContentTypeFactory factory)
   at Our.Umbraco.DocTypeGridEditor.Helpers.DocTypeGridEditorHelper.<>c__DisplayClass15_0.<GetContentTypesByAlias>b__0()
   at Umbraco.Extensions.AppCacheExtensions.<>c__DisplayClass5_0`1.<GetCacheItem>b__0()
   at Umbraco.Cms.Core.Cache.SafeLazy.<>c__DisplayClass1_0.<GetSafeLazy>b__0()
--- End of stack trace from previous location ---
   at Umbraco.Cms.Core.Cache.ObjectCacheAppCache.Get(String key, Func`1 factory, Nullable`1 timeout, Boolean isSliding, String[] dependentFiles)
   at Umbraco.Cms.Core.Cache.ObjectCacheAppCache.Get(String key, Func`1 factory)
   at Umbraco.Cms.Core.Cache.DeepCloneAppCache.Get(String key, Func`1 factory)
   at Umbraco.Extensions.AppCacheExtensions.GetCacheItem[T](IAppCache provider, String cacheKey, Func`1 getCacheItem)
   at Our.Umbraco.DocTypeGridEditor.Helpers.DocTypeGridEditorHelper.GetContentTypesByAlias(String contentTypeAlias)
   at Our.Umbraco.DocTypeGridEditor.Helpers.DocTypeGridEditorHelper.ConvertValue(String id, String contentTypeAlias, String dataJson)
   at Our.Umbraco.DocTypeGridEditor.Helpers.DocTypeGridEditorHelper.RenderDocTypeGridEditorItem(IViewComponentHelper helper, IHtmlHelper htmlHelper, Object model)
   at AspNetCoreGeneratedDocument.App_Plugins_DocTypeGridEditor_Render_DocTypeGridEditor.ExecuteAsync() in D:\a\1\s\DCC.Web.UI\App_Plugins\DocTypeGridEditor\Render\DocTypeGridEditor.cshtml:line 4
   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(IRazorPage page, ViewContext context)
   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(IRazorPage page, ViewContext context, Boolean invokeViewStarts)
   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(ViewContext context)
   at Microsoft.AspNetCore.Mvc.ViewFeatures.HtmlHelper.RenderPartialCoreAsync(String partialViewName, Object model, ViewDataDictionary viewData, TextWriter writer)
   at Microsoft.AspNetCore.Mvc.ViewFeatures.HtmlHelper.PartialAsync(String partialViewName, Object model, ViewDataDictionary viewData)
   at AspNetCoreGeneratedDocument.Views_Partials_Grid_Editors_Base.ExecuteAsync() in D:\a\1\s\DCC.Web.UI\Views\Partials\Grid\Editors\Base.cshtml:line 11