Hi all

I've recently done 2 upgrades from Umbraco 4.9 to Umbraco 4.11.3.1 following the steps described in the upgrade documentation here on our and on each revision on codeplex.

In the one I did yesterday I can't access manage hostnames. On the other one it works perfectly...so wondering if there is something I have missed.

I'm getting this error

Server Error in '/' Application.

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 

[NullReferenceException: Object reference not set to an instance of an object.]

   umbraco.dialogs.AssignDomain.Page_Load(Object sender, EventArgs e) +1157

   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14

   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35

   System.Web.UI.Control.OnLoad(EventArgs e) +91

   umbraco.BasePages.BasePage.OnLoad(EventArgs e) +14

   System.Web.UI.Control.LoadRecursive() +74

   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2207

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272

Does anyone have a clue?

Cheers,

Jan