Information
Enabling this property will send a generic message to the user in the event of an error and not leak information. NOTE: This check audits the default system drive. If your organization's configuration is different the '%systemdrive%' variable will need to be adjusted. NOTE2: Change <framework_version> to the version of .NET that is in use by your organization. NOTE3: Change <PATH> to the directory path to your custom error page.
Solution
Make sure 'Custom Errors defaultRedirect' is set to redirect to a custom error page.