I have upgraded to DNN 7.2 and now see the following error when I goto access the Site Settings page.

Here is the Stack Trace:
DotNetNuke.Services.Exceptions.ModuleLoadException: d:\websites\summerfestivalguide.co.uk\DesktopModules\Admin\Portals\SiteSettings.ascx.cs(1324): error CS0117: 'FriendlyUrlSettings' does not contain a definition for 'VanityUrlPrefixSetting' ---> System.Web.HttpCompileException: d:\websites\summerfestivalguide.co.uk\DesktopModules\Admin\Portals\SiteSettings.ascx.cs(1324): error CS0117: 'FriendlyUrlSettings' does not contain a definition for 'VanityUrlPrefixSetting'
at System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath)
at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate)
at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate)
at System.Web.Compilation.BuildManager.GetVPathBuildResult(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean ensureIsUpToDate)
at System.Web.UI.TemplateControl.LoadControl(VirtualPath virtualPath)
at DotNetNuke.UI.ControlUtilities.LoadControl[T](TemplateControl containerControl, String ControlSrc)
at DotNetNuke.UI.Modules.WebFormsModuleControlFactory.CreateModuleControl(TemplateControl containerControl, ModuleInfo moduleConfiguration)
at DotNetNuke.UI.Modules.ModuleControlFactory.LoadModuleControl(TemplateControl containerControl, ModuleInfo moduleConfiguration)
at DotNetNuke.UI.Modules.ModuleHost.LoadModuleControl()

Any help would be much appreciated.