Value does not fall within the expected range.

[zzzzzzed]

I am getting a 'Value does not fall within the expected range.' error a lot.

If I send the email whilst running in Visual Studio the first time it works then it always fails unless I put a breakpoint in the razor view and step through it in which case it always works.

I have installed the program on a 'live' test server and that fails as well.

Stack trace:

"Value does not fall within the expected range."}
    [System.ArgumentException]: {"Value does not fall within the expected range."}
    Data: {System.Collections.ListDictionaryInternal}
    HelpLink: null
    HResult: -2147024809
    InnerException: null
    Message: "Value does not fall within the expected range."
    Source: "mscorlib"
    StackTrace: "   at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
at System.Runtime.InteropServices.Marshal.ThrowExceptionForHR(Int32 errorCode)
at System.Web.Hosting.IIS7WorkerRequest.GetServerVariableInternal(String name)
at System.Web.Hosting.IIS7WorkerRequest.GetServerVariable(String name)
at System.Web.Hosting.IIS7WorkerRequest.GetRemoteAddress()
at System.Web.HttpWorkerRequest.IsLocal()
at System.Web.HttpRequestWrapper.get_IsLocal()
at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
at System.Web.WebPages.StartPage.RunPage()
at System.Web.WebPages.StartPage.ExecutePageHierarchy()
at System.Web.WebPages.StartPage.RunPage()
at System.Web.WebPages.StartPage.ExecutePageHierarchy()
at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
at System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance)
at System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer)
at Mvc.Mailer.StringResult.ExecuteResult(ControllerContext context) in c:\Dev\GitHub\Mvc.Mailer\StringResult.cs:line 55
at Mvc.Mailer.StringResult.ExecuteResult(ControllerContext context, String mailerName) in c:\Dev\GitHub\Mvc.Mailer\StringResult.cs:line 31
at Mvc.Mailer.MailerBase.EmailBody(String viewName, String masterName) in c:\Dev\GitHub\Mvc.Mailer\MailerBase.cs:line 65
at Mvc.Mailer.MailerBase.PopulateHtmlBody(MailMessage mailMessage, String viewName, String masterName) in c:\Dev\GitHub\Mvc.Mailer\MailerBase.cs:line 147
at Mvc.Mailer.MailerBase.PopulateBody(MailMessage mailMessage, String viewName, String masterName, Dictionary`2 linkedResources) in c:\\Dev\\GitHub\\Mvc.Mailer\\MailerBase.cs:line 120
at Mvc.Mailer.MailerBase.Populate(Action`1 action) in c:\Dev\GitHub\Mvc.Mailer\MailerBase.cs:line 77
at MySite.Mailers.UserMailer.VenueListingDetails(Email email, Venue venue, Guid guid) in c:\Dev\MySite\Mailers\UserMailer.cs:line 75
at MySite.Mailers.MailSender.VenueUpdateDetails(EmailSendRequestDto requestDto) in c:\Dev\MySite\Mailers\MailSender.cs:line 104"
    TargetSite: {Void ThrowExceptionForHRInternal(Int32, IntPtr)}

[zzzzzzed]

I have solved the problem - I was re-using the UserMailer class. As long as I create a new UserMailer() each time I send a mail it seems to be OK.