Solve it with a $20 reward: Can not load model: OSError: Unable to open file (file signature not found)

I am new to streamlit. I am trying to deploy my app on cloud. I have successfully loaded and ran my model(.h5 file) yesterday. However, I can not load my model agian today:

Can anyone help me out please?

Update: I think the model can successfully run, but I did not change anything but keep deleting the app and rerun it. Can anyone help me on making it more stable? I can send you a $20 as a reward to appreciate your effort!

My github repo is: GitHub - zhiliny2/mltest