I have a Kentico site that I inherited that I am getting towards the end of updating to Kentico 13.0.106. It has one problem that is pretty major for me at the moment. At the moment, TinyMCE is breaking, and the Wysiwyg editor is not showing. None of the pages in Content > Pages is therefore editable.
I'm not sure if this is a problem, but the application was including a third-party component that was created by DevTrev called HBS.TinyMCE_Wysiwyg.Kentico.MVC. Because that is locked to Kentico 12, I had to find the source code (luckily Trev published it to github here)
I was able to go in and upgrade the referenced Kentico packages, rebuild the assemblies with Kentico 13.0.106, upgrade my live site to the same version, and reference the new assemblies.
The problem is, TinyMCE isn't working now and I'm not sure why.
When I open a dialog containing the TinyMCE control, it gives me an error:
When I click in the TinyMCE control, I get the following error:
The CMS Admin and live site are both dot net framework 4.8.1 (dot net 6 will come later)
How can I fix this problem?