When I try to go to Site Actions -> Site Settings -> Modify Navigation I get this error: Object reference not set to an instance of an object. at Microsoft.SharePoint.Publishing.Navigation.PortalSiteMapNode.GetNavigationChildren(NodeTypes includedTypes, NodeTypes includedHiddenTypes, Boolean securityTrimmingEnabled, OrderingMethod ordering, AutomaticSortingMethod method, Boolean ascending, Int32 lcid) at Microsoft.SharePoint.Publishing.Internal.CodeBehind.AreaNavigationSettingsPage.AddChildrenToControl(String parentId, PortalSiteMapNode node, Int32 depth, Int32 maxDepth) at Microsoft.SharePoint.Publishing.Internal.CodeBehind.AreaNavigationSettingsPage.AddChildrenToControl(String parentId, PortalSiteMapNode node, Int32 depth, Int32 maxDepth) at Microsoft.SharePoint.Publishing.Internal.CodeBehind.AreaNavigationSettingsPage.InitializeNavigationEditSort() at Microsoft.SharePoint.Publishing.Internal.CodeBehind.AreaNavigationSettingsPage.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) I also have a problem of a page in the navigation that doesn't exist anymore (hence the need to get to the Navigation page). Any ideas on what might be causing this?

Nobody has seen this error before?

Did you customize this site? Oleg

Oleg- Thanks for the response. The only thing customized is the master page and template. The rest is a default publishing site.

Hard to say what is wrong. You can try Site Settings->Reset to site defenition. If this will not help try to swith on default.master. Oleg

I've tried both those steps to no avail, unfortunately. Thanks for the ideas though.

Have hey have had any resolution with this ? i am having the same problems. Thank you

No one has solved this yet?

Try restoring the page you are missing and then deleting it from navigation before you delete it from your system (and if you have this issue after upgrading to 2010 from a 2007 env there is another thread where I posted a blog about http://blogs.tamtam.nl/appie/2010/08/03/SharePoint+2007+To+2010+Upgrade+Issue+With+Navigation.aspx where this and another navigation issue pop-up due to a Dutch install).