Thanks for putting a light on this add-on not seen it myself. I downloaded it and installed it today and got the same errors regarding the script.
Anyway managed to get it working now and its happily streaming as i type this reply.
What you need to do is create 2 folders
One called Images and the other called Subtitles as shown below where there location should be
When you’ve done this give all the folders permissions 777, I also had to do the main plugin.video.itv folder as well.
Hope this helps, It’s a great add-on what i’ve seen so far.