After a fresh install dnn 4.8.0 (RC2) i am getting the error msg : Value cannot be null. Parameter name: path1

with an stack trace:

[ArgumentNullException: Value cannot be null.
Parameter name: path1]
   System.IO.Path.Combine(String path1, String path2) +2791155
   DotNetNuke.UI.Skins.SkinDefaults..ctor(SkinDefaultType DefaultType) +127
   DotNetNuke.Common.Globals.get_DefaultSkin() +31
   DotNetNuke.Entities.Portals.PortalSettings.GetPortalSettings(Int32 TabId, PortalAliasInfo objPortalAliasInfo) +2812
   DotNetNuke.Common.Globals.GetHostPortalSettings() +216
   DotNetNuke.Common.Globals.GetPortalSettings() +79
   DotNetNuke.Authentication.ActiveDirectory.HttpModules.AuthenticationModule.Init(HttpApplication application) +198
   System.Web.HttpApplication.InitModulesCommon() +66
   System.Web.HttpApplication.InitInternal(HttpContext context, HttpApplicationState state, MethodInfo[] handlers) +1006
   System.Web.HttpApplicationFactory.GetNormalApplicationInstance(HttpContext context) +259
   System.Web.HttpApplicationFactory.GetApplicationInstance(HttpContext context) +114
   System.Web.HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr) +350

I have choosen the Authentication option Active Directory in the install options <---

I don't know if this is an dnn problem or an MS problem. Someone had the same error?

Please help me out here.

Same problem here with clean install of 4.8.0 (which I believe is not an RC2 version, but the final version).

Upgrade from 4.7.0 to 4.8.0 does not have this problem, only the clean install.

Please help us solve this as it's not easy to install 4.7 and upgrade it.

Thanks.

Hey There,
The answer is that you can't use dnn 4.8 and the Active Directory Authenitcation provider.
So either don't install it or stay with 4.7 till the problem is sorted out.
Details can be found here:
http://www.dotnetnuke.com/Community/Forums/tabid/795/forumid/89/threadid/192745/scope/posts/Default.aspx

John