ReactJS test app not starting from offsite?

Question

JavaScript

I'm trying to run a simple application from the developer's site, I get the following:

npm i create-react-app -g
....
create-react-app hello_world
Creating a new React app in F:\!!!1Design\React\React_orig\hello_world.

Installing packages. This might take a couple minutes.
Installing react, react-dom, and react-scripts...

npm WARN deprecated [email protected]:

Answer 1

WARN is not an error, it's a warning.
In general, there are 2 more points to be done:
That is, you need to do "npm start" in your new hello_world folder

Answer 2

Congratulations, you have found the toaster bug
Regarding the question: wait for the application to install, then

cd hello_world
npm start