I'm getting the error below on the ModuleDefinitions page after upgrading from 4.9 to 5.2.22.  This file isn't anywhere in the upgrade, install or source code folders.  Has anyone run into this before or has any idea how I can fix it.  Any help would be appreciated!  Thanks!!!!

Error: Module Definition Validator is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: The file '/Admin/ModuleDefinitions/ModuleDefValidator.ascx' does not exist. ---> System.Web.HttpException: The file '/Admin/ModuleDefinitions/ModuleDefValidator.ascx' does not exist. at System.Web.UI.Util.CheckVirtualFileExists(VirtualPath virtualPath) at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.Compilation.BuildManager.GetVPathBuildResult(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) at System.Web.UI.TemplateControl.LoadControl(VirtualPath virtualPath) at System.Web.UI.TemplateControl.LoadControl(String virtualPath) at DotNetNuke.UI.ControlUtilities.LoadControl[T](TemplateControl containerControl, String ControlSrc) at DotNetNuke.UI.Modules.ModuleHost.LoadModuleControl() --- End of inner exception stack trace ---

THank you for your reply!  I've tried re-doing the upgrade multiple times...including trying other version of dnn.  Do you have any other suggestions for me to try?