OK, I have removed the virtual directory I created.

here is the modules setion of my web config file.

<httpModules>
      <!-- add name="Authentication" type="DotNetNuke.HttpModules.AuthenticationModule, DotNetNuke.HttpModules.Authentication" / -->
      <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=xxxxxx" />
      <add name="Compression" type="DotNetNuke.HttpModules.Compression.CompressionModule, DotNetNuke.HttpModules" />
      <add name="RequestFilter" type="DotNetNuke.HttpModules.RequestFilter.RequestFilterModule, DotNetNuke.HttpModules" />
      <add name="UrlRewrite" type="DotNetNuke.HttpModules.UrlRewriteModule, DotNetNuke.HttpModules" />
      <add name="Exception" type="DotNetNuke.HttpModules.Exceptions.ExceptionModule, DotNetNuke.HttpModules" />
      <add name="UsersOnline" type="DotNetNuke.HttpModules.UsersOnline.UsersOnlineModule, DotNetNuke.HttpModules" />
      <add name="DNNMembership" type="DotNetNuke.HttpModules.Membership.MembershipModule, DotNetNuke.HttpModules" />
      <add name="Personalization" type="DotNetNuke.HttpModules.Personalization.PersonalizationModule, DotNetNuke.HttpModules" />
   </httpModules>

if I add the <clear/> to it I get the following error

<!-- Web.Config Configuration File -->

<configuration>
    <system.web>
        <customErrors mode="Off"/>
    </system.web>
</configuration>
Notes: The current error page you are seeing can be replaced by a custom error page by modifying the "defaultRedirect" attribute of the application's <customErrors> configuration tag to point to a custom error page URL.

<!-- Web.Config Configuration File -->

<configuration>
    <system.web>
        <customErrors mode="RemoteOnly" defaultRedirect="mycustompage.htm"/>
    </system.web>
</configuration>

this is crazy...all I'm trying to do is run a few asp.net applications on the same IIS server as dnn.

Parser Error Message: The code subdirectory '/eCatalog/App_Code/HTML/' does not exist.

Source Error:

Line 111:      -->
Line 112:      <codeSubDirectories>
Line 113:        <add directoryName="HTML" />
Line 114:        <add directoryName="IFrame" />
Line 115:        <add directoryName="Survey" />

App_Code/HTML is part of dnn not my app. why is it looking for that directory?   in my other apps web.config file (not dnn's) I added the <clear/> to the modules and this is what I get.