title: Web.config Custom Errors mode Conflict
body: <p>I have a great and important problem with Web.Config, I need to see the Error of my page and resolve it in asp.net web form and web config, but when Error Occurred, I see another error and I see this Message : </p>
  
  <blockquote>
    <p>customErrors mode to Off or On Or RemoteOnly,</p>
  </blockquote>
  
  <p>I set this property Off, but do not show error and say again please set attribute to On your CustomError.</p>
  
  <p><img src="https://i.stack.imgur.com/2ZzPb.jpg" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/Ayvbh.jpg" alt="enter image description here"></p>
  
  <p>when I set mode to On,say Please set customErrors mode to On Again.</p>
  
  <p><img src="https://i.stack.imgur.com/Deya7.jpg" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/tXTCG.jpg" alt="enter image description here"></p>