It says that the group "A" already exists, but thats wrong.
I think its because that it has conflicts with the group "Administrator".

also, no errors in console.

Have you tried using apostrophes around the group name when you enter the command?

the photo at in the main comment

That shows an error, not exactly what the command was that you typed.

i did not include the command i typed, no.
but im now sayng that i used " around the command.

That is a quotation mark. Try apostrophes. 'word'

Yes, i did it in the example

What "example"?

It's been a day since the last post. Problem solved?

Nope, 'A' just creates a group named 'A' with the apostrophes.