I have been following a freecodecamp youtube tutorial on full-stack development and I am getting an error and can not find the solution. here is the code:
it means you’re trying to set value to a property which doesn’t exist…
you can first try “troubleshooting” it, see if that property “onClick” event exist or not
otherwise consider sharing a “sandbox” environment link or “code snippet”, so that people can look into it and not just a picture (which is not always much helpful)
happy learning 
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Why not just share the Replit link?
My best guess is you typoed the id used on the buttons in your selector. You have buton instead of button