Apps Notepad android app with room database getting crashed after enter the data

[supvastav]

I am a beginner in android and working on my first android project "notepad" by using internet resources. I have followed one of the tutorials to build a notepad android app, where they are using room database and view binding...but after successfully completion, when I am installing this app in the phone and entering the data, app getting crashed...I am not able to find the error...your support and answer would be much appreciated...I am putting the code below, would be appreciable, if you review the code and figure out the solution.

Thanks in advance