This does not appear to be a SketchUp model! it's happening frequently

I have been working on this project for the past few days, which I have to submit tomorrow. Open the file today and see this situation.
Opening the backup file shows “Failed to Open”. I had to redo everything if the same problem happened before. Now what can I do?
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SketchUp File

The most common reason for this error is saving to an external drive or cloud location.

I saved it to an internal drive.
Can you please give me an idea of how to fix the file?

The only option you have is to wait for @colin to look at it when he comes along, he is one of the few with tools that, might, only might, have a chance to recover something from it.

That file is completely filled with zeros. Check in the same folder to see if there is an SKB copy of the file.