Just upgraded from dnn 7.0.6 to dnn 7.1.0 and installed active directory provider.
When I tried to open edit page under Admin > Extension to configure AD. I got this message.

AssemblyVersion: 7.1.0
PortalID: 0
PortalName: Campus Recreation Services
UserID: 1
UserName: host
ActiveTabID: 65
ActiveTabName: Extensions
RawURL: /Admin/Extensions/tabid/65/ctl/Edit/mid/387/PackageID/1141/Default.aspx?popUp=true
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://128.8.164.157/Admin/Extensions.aspx
UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke
ExceptionGUID: 464d1ad6-afaa-407d-80f0-faa8cbc176c8
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.Professional.Authentication.ActiveDirectory.Settings.OnInit
StackTrace:
Message: DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Professional.Authentication.ActiveDirectory.Settings.OnInit(EventArgs e) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.AddedControl(Control control, Int32 index) at DotNetNuke.Modules.Admin.Extensions.EditExtension.BindData() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---


Any feedback will help.

Thanks.