Server Error in '/' Application.

SiteUrl invalid: there must not be modules on startpage!

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: SiteUrl invalid: there must not be modules on startpage!

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[InvalidOperationException: SiteUrl invalid: there must not be modules on startpage!]
   WebCore.Components.CanonicalUrl.get_Url() +327
   WebCore.Web.UI.Controls.WebPage.Render(HtmlTextWriter writer) +9639
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +132
   System.Web.UI.<ProcessRequestMainAsync>d__523.MoveNext() +14540


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.4087.0