title: Got a PlatformNotSupportedException
body: <p>Suddenly while i try to run my web application I got this:</p>
  
  <blockquote>
    <p>PlatformNotSupportedException Error</p>
  </blockquote>
  
  <p>I mentioned the Exception details below:</p>
  
  <blockquote>
    <p>[PlatformNotSupportedException: This operation requires IIS integrated
    pipeline mode.]    System.Web.HttpResponse.get_Headers() +9710022<br>
    System.Web.HttpResponseWrapper.get_Headers() +9<br>
    Microsoft.Owin.Host.SystemWeb.CallHeaders.AspNetResponseHeaders..ctor(HttpResponseBase
    response) +72<br>
    Microsoft.Owin.Host.SystemWeb.OwinCallContext.CreateEnvironment() +434
    Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContext.GetInitialEnvironment(HttpApplication
    application) +303<br>
    Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContext.PrepareInitialContext(HttpApplication
    application) +65<br>
    Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContextStage.BeginEvent(Object
    sender, EventArgs e, AsyncCallback cb, Object extradata) +622<br>
    System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
    +285    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +155</p>
  </blockquote>
  
  <p><img src="https://i.stack.imgur.com/lOHlt.jpg" alt="enter image description here"></p>