Tutorial on reacts.org trying to set up a new project

i want to create a new project locally following the instruction on: https://reactjs.org/tutorial/tutorial.html#setup-option-2-local-development-environment —> where it says run –> npx create-react-app my app

i tried doing that but i get Error code E404

What does it mean?

>Solution :

You should put like my-app not my app because my and app will be two seperate argument.

npx create-react-app my-app