System.ArgumentException: The string parameter 'url' cannot be null or empty. Parameter name: url at System.Web.UI.ClientScriptManager.RegisterClientScriptInclude(Type type, String key, String url, Boolean isResource) at Digitvision.Portal.Core.Utilities.UIControls.AddScriptToInclude(String key, String src, Page _page) at Digitvision.Portal.Website.UI.Control.PopupCalendar.Page_Init(Object sender, EventArgs e) at System.Web.UI.Control.OnInit(EventArgs e) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.AddedControl(Control control, Int32 index) at Digitvision.Portal.Core.MasterPage.UserControlPageBase.LoadSkinSrc(WebPartInfo objWebPartInfo, PageWebPartInfo objPageWebpartInfo, Control _Control, PageModuleInfo objPageModuleInfo, UserInfo objCurrentUserInfo, PageInfo objPageInfo, List`1 colPageModuleSettingInfo, String& sb, Boolean TidyVersion, Boolean _isAdminNew) at Digitvision.Portal.Core.MasterPage.UserControlPageBase.LoadSkinSrc(WebPartInfo objWebPartInfo, PageWebPartInfo objPageWebpartInfo, Control _Control, PageModuleInfo objPageModuleInfo, UserInfo objCurrentUserInfo, PageInfo objPageInfo, List`1 colPageModuleSettingInfo, String& sb)