After fixing several users' severally broken compositions that could not be opened any more and throwing an error message, I decided to write a tutorial on how to recover files and being able to get back to work in 10 to 15 minutes. I devised this recovery process after having the intuition that it would be possible to rebuild the an file.
Please find the tutorial on either site.
This can be really useful !
No problem, always happy to help users when I can or know how!
Actually this procedure can be used when any error occurs while you are working. I think that it should save a headaches. The only time it will not work is when the action.js file data is deleted.