Anyone know what this error means?

Tried opening a file and it says

“The following errors occured:
-cannot open an empty project adding an default empty scean
-syntax error at line 1:
unreconized attribute (<)”

The project isn’t empty so i don’t know why it would say that

This means that the saving file (ex, .anim) you have in that scene folder has been corrupted and cannot be read when opening the scene.
If you have a back up, use the backup file. If you do not have one, you can try renaming the previous saving file if it works. In saved project folder, there is a file called .anim and .anim~. Also .aux and .aux~. Anything with ~ means is the last save file kept when the project is saved. Make sure backup by duplicating project folder before trying it.