TinyMCE not loading after upgrading from 8.9 to 9.10

Hi,

So I am running into a weird problem.

I updated our site from 8.9 to 9.10. After doing this, the CMS is not loading the tinyMCE editor. I am getitng this error http://localhost:59458/Util/Editor/tinymce/plugins//editor_plugin.js?moduleArea=Util net::ERR_ABORTED

I am looking around for Util/Editor, but I can't find it.  Where shoudl it be?