Server cannot set status after HTTP

Any one help me

have download exce file

System.Web.HttpException

Server cannot set status after HTTP headers have been sent.

System.Web.HttpException (0x80004005): Server cannot set status after HTTP headers have been sent.

at System.Web.HttpResponse.set_StatusCode(Int32 value)

at System.Web.Mvc.HandleErrorAttribute.OnException(ExceptionContext filterContext)

at System.Web.Mvc.ControllerActionInvoker.InvokeExceptionFilters(ControllerContext controllerContext, IList`1 filters, Exception exception)

at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.b__22(IAsyncResult asyncResult)

at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult)

at System.Web.Mvc.Controller.<>c__DisplayClass1d.b__18(IAsyncResult asyncResult)

at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.b__3(IAsyncResult ar)

at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult)

at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.b__3(IAsyncResult ar)

at System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult)

at System.Web.Mvc.MvcHandler.<>c__DisplayClass8.b__3(IAsyncResult asyncResult)

at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.b__3(IAsyncResult ar)

at System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult)

at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()

at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

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