This error may occur if CausesValidation is set to true and databound controls (with custom validators based on the databound elements) have not yet been loaded. System.Web.HttpRequestValidationException (0x80004005): The URL contains characters that can be used for a cross-site scripting attack. at Wyndham.Ccfs.Web.Application.Utilities.Fusion.FusionUtilities.PreventInvalidCharsUrls() in C:\TFS2015\TR4-Oct-2017\src\Website\Wyndham.Ccfs.Web.Application\Utilities\Fusion\FusionUtilities.cs:line 23 at Wyndham.Ccfs.Web.layouts.WyndhamCcfs.Default.BaseLayoutControl.Page_Init(Object sender, EventArgs e) in C:\TFS2015\TR4-Oct-2017\src\Website\Wyndham.Ccfs.Web\layouts\WyndhamCcfs\Default\BaseLayoutControl.ascx.cs:line 15 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.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequest(HttpContext context) at Fusion.Web.Base.ToolKitPageBase`1.ProcessRequest(HttpContext _context) in C:\TFS2015\FusionSitecore\Sitecore\Fusion.Web.Base\Baseclass\Toolkitbase\ToolKitPageBase_Events.cs:line 53