Please share your file in zipped form for us to check the issue.
These kind of error occurs only if you have two elements of the same name inside the one symbol.
Please give a different name to it, and you will be able to get rid of this issue.
As I wrote, I can't open my project in Animate to make any changes. Anyway, I've found the latest backup of the project, so I better keep working since that point. Thanks for help!
As far as I can see, EA doesn't allow the user to create items with the same name. If you try to create an identical name, for instance in renaming, it reverts to the previous name.
So how in the world can this even happen?
And so how can I correctly comb the code to fix it?