Hi,

I tried to add child portal on my site, but failed for some reason. From then on, I can't navigate to some child portals. So I upgraded DNN from version 4.8.4 to 4.9.3, unfortunately, this issue didn't be fixed.

Error info as follows:
AssemblyVersion: 04.09.03
PortalID: 11
PortalName: skin demo
UserID: 4
UserName: myerhu
ActiveTabID: 518
ActiveTabName: Home
RawURL: /Default.aspx?tabid=518&error=Object+reference+not+set+to+an+instance+of+an+object.&content=0
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.china-great-web.com/Default.aspx?tabid=17&portalid=0
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.0.9) Gecko/2009040821 Firefox/3.0.9
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 6636d6f0-6b06-4e51-97da-e359e81fe805
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.Framework.DefaultPage.Page_Init
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.Framework.DefaultPage.Page_Init(Object sender, EventArgs e) at System.Web.UI.Control.OnInit(EventArgs e) at System.Web.UI.Page.OnInit(EventArgs e) at DotNetNuke.Framework.PageBase.OnInit(EventArgs e) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---
Source:
Server Name: WSS33

Any idea to fix it?

Thanks,

Reed