Getting exception on set default page programatically on feature activated in SharePoint-2010

Question

my code on feature activated is

public override void FeatureActivated(SPFeatureReceiverProperties properties)
    {
        using (SPSite SiteInUserContext = new SPSite((properties.Feature.Parent as SPWeb).Url))
        {
            using (SPWeb webInUserContext = SiteInUserContext.OpenWeb())
            {
                    webInUserContext.AllowUnsafeUpdates = true;
                    SPFolder objFolder = webInUserContext.RootFolder;
                    objFolder.WelcomePage = "default.aspx";
                    objFolder.Update();
                    webInUserContext.AllowUnsafeUpdates = false;
            }    
        }
    }

Exception details is:

Note : This exception occurs only when set default page on feature activated or feature deactivated.

How to resolve this exception ?

Thanks

Answer 1

Instead of using,

objFolder.WelcomePage = "default.aspx";

try,

objFolder.WelcomePage = "Pages/default.aspx";

Source