My synfig file is not opening it says(errror bone not found)

what can i do to fix it

Hi and welcome here :slight_smile:
It is sadely a very common issue, answered many times on this forum
Please use the search function, the result is not guaranted but it’s worth to have a try:

And as I always recommend: Don’t use autosave and do regularly manual backups

Did you copy and paste any skeleton/bone?

Yes I did iam not going do it again