Assignment Code missing

I did complete assignment 1 but there was large rmse so i failed it. i was thinking to minimize error but when i opened my submitted file all codes that i wrote has disappeared. how can i get it back. or did i opened wrong files. please help.
I opened the link that shows in submission history.

If you don’t see any code in the current version, you can change the version of the notebook, it should be there in another version of the notebook. Check the version option on the top right side of the notebook.

I am so thankful that you replied. But just to let you know that your strategy of changing the version didnt actually work. I did wrote all the codes again but thanks for your suggestion.

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