Can't get to localhost:3000 and welcome to express

I have just started learning node.js and I have been following this tutorial. I did all the things mentioned there but when I write npm start on the cmd I couldn't go to the "welcome to express" page. I have attached the screenshot with the errors I am getting.

I googled a lot of things but couldn't find an answer.

here are the screenshots:

P.s. ->(If this is worth mentioning) I also executed npm install mysql (from some other tutorial since I wanted to use mysql) instead of mongodb written in the linked tutorial.