the SpellCheck.aspx first line already looks like this

 

my project web.config looks liek this

 

 

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
 <system.web>
  <machineKey validationKey="A96B2F3BF50A1A2A1B81214A550B89F2A318B3712FB5AC8CD82AF4F3925B3C6ED58CF5F38503629A78BF8C27B1B736C4E84DACE342AB83A42932B44EBC3D7601" decryptionKey="D01201C69DF5E9863133028CBD4E6EEFC45B5E609D7F4107" validation="SHA1" />
  <healthMonitoring enabled="true">
   <rules>
    <add name="All Errors Email" eventName="All Errors" provider="EmailWebEventProvider" profile="Default" minInstances="1" maxLimit="Infinite" minInterval="00:00:10" />
   </rules>
  </healthMonitoring>
  <pages validateRequest="false" enableEventValidation="false" controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID">
  </pages>
  <!-- error stuff goes here-->
  <customErrors defaultRedirect="Error.aspx" mode="Off">
   <error statusCode="404" redirect="Error.aspx?e=404" />
  </customErrors>
  <!--
          Set compilation debug="true" to insert debugging
          symbols into the compiled page. Because this
          affects performance, set this value to true only
          during development.
    -->
  <compilation debug="false" targetFramework="4.0">
   <assemblies>
    
    <add assembly="System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
    <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
    <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
    <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /></assemblies>
  </compilation>
 </system.web>
 <location allowOverride="true">
  <appSettings>
   <add key="ProductionServer" value="PRODUCTION1" />
  </appSettings>
  <system.web>
   <sessionState timeout="60" />
  </system.web>
        <system.webServer>
            <httpErrors>
                <remove statusCode="404" subStatusCode="-1" />
                <error statusCode="404" prefixLanguageFilePath="" path="/redirects.aspx" responseMode="ExecuteURL" />
            </httpErrors>
        </system.webServer>
 </location>
</configuration>