Error occurred opening file

[YourNormalAnimator]

So I was working on a project and left it for 1 day. When I came back and opened it then I got an error saying "Error occured opening file". I didn't know what to do. I search in the communty suport to see if someone had the same problem as me and a some people did. But I followed every answer in the posts and nothing helped me. I tried making it to a rar file which was the most common way to fix the problem but it didn't help me at all. Please help me!

[n. tilcheff]

Unfortunately, the only reliable way is to have backups.

Save variants (Flie > Save As... > MyFile_01.fla, then MyFile_02.fla, MyFile_03.fla and so on) every few hours while working. Keep 3 copies of everything on different storage devices, at least one of them totally unplugged at all times, except during backup.