Object reference not set to an instance of an object.

at Embrace.Website.Helpers.ContentHelper.GetSiteNode()
at Embrace.Website.Helpers.NotFound404Helper.TryFindContent(PublishedContentRequest contentRequest)
at Umbraco.Web.Routing.PublishedContentRequestEngine.HandlePublishedContent()
at Umbraco.Web.Routing.PublishedContentRequestEngine.FindPublishedContentAndTemplate()
at Umbraco.Web.Routing.PublishedContentRequestEngine.PrepareRequest()
at Umbraco.Web.UmbracoModule.ProcessRequest(HttpContextBase httpContext)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)