Oh... thank you very much, Mr. Gama11. Would it be properly to use Visual Code with HaxeFlixel or I am going to have problems/lose something if I do not use Sublime?

So... as requested by the site I have installed Haxe 3 and OpenFL and I am sure they are working properly. I then used this command line in prompt: haxelib install flixel and finaly I have downloaded the .zip "flixel-master", altough I don't know what I should do with it.

When I try to create a project with the line: flixel tpl -n "HelloWorld"
I end up getting this on command prompt:

What am I doing wrong?