ASP.NET site returns Server Error in '/'Application.

Programming, error messages and sample code > ASP.NET
If you see "Server Error in '/'Application." in your site, you can do the following to see the actual error message:

Edit your web.config,  change customErrors Mode  to

<customErrors mode="Off"/>

You'll be able to see your actual error.  Please make sure it's "Off",  not "off".