I'm using Main.tsx instead of Main.js and receive "Main.jsx doesn't exist"

I'm using Main.tsx instead of Main.js and receive "Main.jsx doesn't exist" Do you know what can be the reason?

The Error I'm getting after running the npm start command: The Error I'm getting after running the npm start command:

This is the Main.tsx file:

This is the Index.tsx file:

This is the package.json file: