Hi @ashroy, welcome to the Streamlit community!! 
We’re glad you’ve chosen Streamlit to develop and deploy your NLP application!
Streamlit apps are launched using the command: streamlit run app.py, where app.py is the Python script containing the code for your app. For example, your app could be called MINetApplication.py.
Similarly, Streamlit sharing expects the code for your app to be in a .py file. It is unable to find the file in your repo and thus returns an error. You can solve this by creating a .py file with the code from your Jupyter notebook* and deploying that Python file.
*Note: Your notebook contains a couple of Jupyter specific commands (magics) such as !pip install stanza and %time that you should not copy over into your .py file.
Happy Streamlit-ing! 
Snehan