Installing ERP next on mac Catalina 10.15.4 errors

Hello every one
I’m trying to install ERP-Next on local host (mac Catalina 10.15.4) I followed the way here in this link Installing ERPNext on macOS
when I reached to the step (bench new-site site1.local), the error appear:
WARN: Command not being executed in bench directory

Usage: bench [OPTIONS] COMMAND [ARGS]…

Try “bench --help” for help.

Error: No such command “new-site”.
can you help please>>>