I'm using the latest version of DNN. I added Social Groups and have had issues ever since.

I am unable to control some of the Host tabs (page cannot be found).

When adding a social group, I get the A critical error has occurred.Object reference not set to an instance of an object. error.

The event viewer shows this:

AssemblyVersion: 6.2.3

PortalID: 0

PortalName: Evaluations, Data, Support

UserID: 1

UserName: host

ActiveTabID: 108

ActiveTabName: Tracker

RawURL: /online/ControlPanel/Administrator/Tracker/tabid/108/ctl/Create/mid/538/Default.aspx?popUp=true

AbsoluteURL: /online/Default.aspx

AbsoluteURLReferrer: http://myrurl.com/online/ControlPanel...

UserAgent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)

DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider

ExceptionGUID: 69871e58-4699-48d2-8761-ec8439073cb8

InnerException: Object reference not set to an instance of an object.

FileName:

FileLineNumber: 0

FileColumnNumber: 0

Method: DotNetNuke.Services.Social.Notifications.NotificationsControllerImpl.<SendNotification>b__5

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.Services.Social.Notifications.NotificationsControllerImpl.<SendNotification>b__5(RoleInfo role) at System.Linq.Enumerable.WhereListIterator`1.MoveNext() at DotNetNuke.Services.Social.Notifications.NotificationsControllerImpl.SendNotification(Notification notification, Int32 portalId, IList`1 roles, IList`1 users) at DotNetNuke.Modules.Groups.Components.Notifications.AddGroupNotification(String notificationTypeName, Int32 tabId, Int32 moduleId, RoleInfo group, UserInfo initiatingUser, IList`1 moderators, UserInfo recipient) at DotNetNuke.Modules.Groups.Components.Notifications.AddGroupNotification(String notificationTypeName, Int32 tabId, Int32 moduleId, RoleInfo group, UserInfo initiatingUser, IList`1 moderators) at DotNetNuke.Modules.Groups.Create.Create_Click(Object sender, EventArgs e) at System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e) at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---

Source:

Server Name: name