"The same key was already used for another template!'

[Valter479]

I keep getting the following error:

System.InvalidOperationException

The same key was already used for another template!

System.InvalidOperationException: The same key was already used for another template!
   at RazorEngine.Templating.DelegateTemplateManager.<>c__DisplayClass1.<AddDynamic>b__0(ITemplateKey k, ITemplateSource oldSource)
   at System.Collections.Concurrent.ConcurrentDictionary`2.AddOrUpdate(TKey key, TValue addValue, Func`3 updateValueFactory)
   at RazorEngine.Templating.DelegateTemplateManager.AddDynamic(ITemplateKey key, ITemplateSource source)
   at RazorEngine.Templating.TemplateService.GetKeyAndAdd(String template, String name)
   at RazorEngine.Templating.TemplateService.GetTemplate(String razorTemplate, Object model, String cacheName)
   at RazorEngine.Templating.TemplateService.Parse(String razorTemplate, Object model, DynamicViewBag viewBag, String cacheName)
   at RazorEngine.Razor.Parse(String razorTemplate, Object model, String cacheName)
   at Postal.FileSystemRazorView.Render(ViewContext viewContext, TextWriter writer)
   at Postal.EmailViewRenderer.RenderView(IView view, ViewDataDictionary viewData, ControllerContext controllerContext, ImageEmbedder imageEmbedder)
   at Postal.EmailViewRenderer.Render(Email email, String viewName)
   at Postal.EmailService.CreateMailMessage(Email email)
   at Postal.EmailService.Send(Email email)

I am not sure why?

I am using hangfire to send email as background job.

[dmbritos]

I have the same issue, also using hangfire to send emails as background job. It seems to occur after editing the template while running the application. This post seems to be related (see the first item under "Explanation" in the matthid's answer):

http://stackoverflow.com/questions/29803561/razorengine-error-trying-to-send-email

[jacksonmarina12]

Looks like you're encountering a key conflict issue. Have you tried checking door cable if the key is being reused elsewhere in your templates? That might help resolve the problem.