Server Error in '/' Application.

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[NullReferenceException: Object reference not set to an instance of an object.]
   YerelServisler.WebApiApplication.Application_PreSendRequestHeaders(Object sender, EventArgs e) in D:\localapibin\ffyeni\YerelServisler\Global.asax.cs:32
   System.Web.SendResponseExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +190
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +50
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +73