Hi John,

I recently get this error which is driving me mad. Each time it occurs, it breaks my Host Settings & Event Viewer pages. After restarting the server, everything is back to normal until that error pops out again.

Could you take a look at the error log? I'm running DNN 4.8.0 on a VPS account (fresh install)

AssemblyVersion: 04.08.00
PortalID: 0
PortalName: DotNetNuke
UserID: 1
UserName: host
ActiveTabID: 19
ActiveTabName: File Manager
RawURL: /Host/File Manager/tabid/19/ctl/Edit/mid/323/ftype/Module/rtab/18/portalid/0/language/en-US/Default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://mysite.com/Host/File%20Manager/tabid/19/ctl/Edit/mid/323/ftype/Module/rtab/18/portalid/0/language/en-US/Default.aspx
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.3;MEGAUPLOAD 1.0
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 10daae72-8722-4edc-9f93-47c506b55cd5
InnerException: Multiple controls with the same ID 'ScriptManager' were found. FindControl requires that controls have unique IDs.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.Web.UI.Control.FillNamedControlsTable
StackTrace:
Message: DotNetNuke.Services.Exceptions.PageLoadException: Multiple controls with the same ID 'ScriptManager' were found. FindControl requires that controls have unique IDs. ---> System.Web.HttpException: Multiple controls with the same ID 'ScriptManager' were found. FindControl requires that controls have unique IDs. at System.Web.UI.Control.FillNamedControlsTable(Control namingContainer, ControlCollection controls) at System.Web.UI.Control.FillNamedControlsTable(Control namingContainer, ControlCollection controls) at System.Web.UI.Control.FillNamedControlsTable(Control namingContainer, ControlCollection controls) at System.Web.UI.Control.EnsureNamedControlsTable() at System.Web.UI.Control.FindControl(String id, Int32 pathOffset) at System.Web.UI.Page.FindControl(String id) at DotNetNuke.Framework.DefaultPage.SetSkinDoctype(String SkinPath) at DotNetNuke.Framework.DefaultPage.LoadSkin(String SkinPath) 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 ---

It looks like you are not the only one:

http://support.dotnetnuke.com/issue/ViewIssue.aspx?id=6862&PROJID=2

Thanks John,

Will give it a shot and let you know if it works.

Just curious, what does Systems.Web.Extensions.dll do? Will it affect other features?

That DLL is the one that has the ScriptModule. Ajax will not work without it, but it may already be available on your server at a higher level. If everything still works without it in the /bin, then it is coming from a higher level on the machine called the GAC.

All that being said, the above guess probably won't fix it for you. I did a little more looking into this, and I think the problem stems from the core DNN code not doing a good enough job of making sure there is only one on the page. Why more than one is getting injected is a mystery though.

You're right John. It comes from DNN core. I had to turn Ajax off until the core team fixes this bug.