I am unable to install modules in Orchard 1.4.
I get: Package installation failed: There was an error installing the requested package. This can happen if the server does not have write access to the '~/Modules' or '~/Themes' folder of the web site. If the site is running in shared hosted environement,
adding write access to these folders sometimes needs to be done manually through the Hoster control panel. Once Themes and Modules have been installed, it is recommended to remove write access to these folders.
The IIS_IUSRS user have full permissions on App_data, Themes, and Modules.
Server is running Windows Server 2008, IIS 7.5.
The application pool is running .NET Framework 4.0, Integrated Pipeline Mode, and ApplicationPoolIdentity
I turned CustomErrors to Off in Web.Config, but i am not getting a stack trace or anything specific i can use to find the cause.