TV Tunes Error

Hi
Have been using XBMC/Kodi for years now and on the whole not too many problems have arisen.
I’m using the latest Kodi on a Windows 10 pc and today when I added extra files to my library and went to use Tv Tunes (latest) an error popped up saying “Error, Theme Library Unavailable”.
I have restarted Kodi and the pc but still same problem. I get this error on all movies as well as tv shows.

Any ideas…….and thankyou in advance as always