C# Web.config file giving unknown issues

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C#

ASP.NET

Windows

WebForms

Win8

, +

<system.web>
    <compilation debug="true" targetFramework="4.5"/>
    <pages controlRenderingCompatibilityVersion="4.5" clientIDMode="AutoID"/>
    <authentication mode="Forms">
      <forms loginUrl="login.aspx" name=".EMSAUTH" protection="All">
      </forms>
    </authentication>
    <authorization>
      <deny users="?" />
    </authorization>
  </system.web>
  <location path="Client.aspx">
        <system.web>
        <authorization>
            <allow users="*"  />
        </authorization>
        </system.web>
        </location>

This is part of my Web.config file.

I have another app that I copied the code from and it works perfectly on the other app, but I keep getting a 'Error 52 Unrecognized configuration section authentication.'

Please could some one help me here, I have google'd and what people gave was the exact same thing.

I do not know why it is doing this.

Thanks