WYSIWYG Editor not showing

Silverstripe 4.0

I’m upgrading my current website build locally to silverstripe 4, ran through a few issues on the way but everything is sorted now apart from the main content WYSIWYG editor not showing at all, when I inspect element theres a load of console errors referring to the tinyMCE files.

Have attached an image of my console errors, not sure if i’m missing any files?