Page and template migration issue 3.7 to 4.1

Pages and templates come in but are not associated with the templates.
In edit mode they are empty but can be viewed in live mode. In live mode the content is there with no template.

On attempting to assign a template (.master) to some of the pages, we get this error

[NullReferenceException: Object reference not set to an instance of an object.]
   Telerik.Sitefinity.Modules.GenericContent.ContentManager.IsContentBlockHtmlObsolete(String serverSideControlID, Guid pageId, ContentLifecycleStatus clcStatus, CultureInfo culture, String pageProviderName) +209
   Telerik.Sitefinity.Modules.GenericContent.ContentManager.IsContentBlockHtmlObsolete(String serverSideControlID, Guid pageId, ContentLifecycleStatus clcStatus, CultureInfo culture) +71
   Telerik.Sitefinity.Modules.GenericContent.ContentManager.IsContentBlockHtmlObsolete(String serverSideControlID, Guid pageId, ContentLifecycleStatus clcStatus) +121
   Telerik.Sitefinity.Modules.GenericContent.Web.UI.ContentBlock.get_IsOutDated() +277
   Telerik.Sitefinity.Modules.GenericContent.Web.UI.ContentBlock.get_CustomMessages() +193
   Telerik.Sitefinity.Web.UI.ZoneEditor.CustomizeControlDockTitlebar(Control control, RadDock dock) +169
   Telerik.Sitefinity.Web.UI.ZoneEditor.AddControlToContainer(ControlData controlData, Control container, Boolean addLast) +419
   Telerik.Sitefinity.Web.UI.ZoneEditor.AddControlDocksToZone(String placeHolderId, Control zone) +161
   Telerik.Sitefinity.Web.UI.ZoneEditor.ProcessPlaceholder(Control placeholder) +159
   Telerik.Sitefinity.Web.UI.ZoneEditor.ProcessPlaceholders() +117
   Telerik.Sitefinity.Web.UI.ZoneEditor.CreateChildControls() +117
   System.Web.UI.Control.EnsureChildControls() +102
   System.Web.UI.Control.PreRenderRecursiveInternal() +42
   System.Web.UI.Control.PreRenderRecursiveInternal() +175
   System.Web.UI.Control.PreRenderRecursiveInternal() +175
   System.Web.UI.Control.PreRenderRecursiveInternal() +175
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2496

There is a link associated with this particular error on the forums
http://www.sitefinity.com/devnet/forums/sitefinity-4-x/general-discussions/database-missing-error-when-upgrading-to-4-1.aspx

but this did not update any rows. We ran it over the migrated 4.1 database. Should we have run it over the 3.7 one first? Or, perhaps is the ContentBlock or ContentBlockBase different?

Anyway, the major problem we have at the moment is around 1900 pages without associated templates. Happy to run diagnostic SQL queries and return results if that helps.

Hi Nick,

This error occurs because of the new shared content block behaviour. It has been resolved in 4.1 SP1 that is due to be released today (Friday).

Hi Lubomir.
Thanks for the update, this does fix the content block error. However, the service pack (4.1 SP1) appears to cause another error around the AJAX controls, when re-running the migration tool. It appears the MS AJAX framework fails to load.
Had a look around the forums and this http://www.telerik.com/community/forums/aspnet/ajax/asp-net-ajax-client-side-framework-failed-to-load.aspx seemed related, but none of the fixes in there seemed to work.

Regards,
Nick

Hello Nick,

It looks like there is an issue with loading the AJAX Framework. This does not seem to be related to the migration tool. Is there are difference if you run the projects through VS. Have you tried to use another machine or virtual server?
Greetings,
Ivan Dimitrov
the Telerik team

Looks like the easiest thing for us will be to revert to the AjaxControlToolKit.dll  3.0.20820.16598 for our custom controls. Thanks for the updates.