Accidental deletion of C1_W2 -Assignment file

I had completed the assignment but graded showed zero. Trying troubleshoot I lost the file.
Now when I try open, it shows 404 error.

Help recover please.

When you have the 404 error shown, use the “Help → Get latest version” tool.
Then you will have to use the File → Open menu to open the file.
Also use Kernel → Restart.