When trying to create site an error occured

[Rakesh1]

i am new to install erpnext and i used this site for installation:-

Guide: Manual Install ERPNext on Ubuntu 17.xx & 18.xx

NOTE: 1). Clean install on Ubuntu 2). User is bench with sudo privileges 3). Installed on Virtualbox Virtual machines Login to your Local User Prerequisites Ubuntu 17.XX or 18.XX server instance. sudo apt update sudo apt -y upgrade Install Development Tools ERPNext needs Python version 2.7 to work. Install Python 2.7. sudo apt -y install python-minimal You should be able to verify its version. python -V Install a few more dependencies. sudo apt -y install git build-essential python-se…

and i am not able to create new site for local host.

i am using command for creating new site:-
$ bench new-site sitename.local

and found following error:-
Usage: bench [OPTIONS] COMMAND [ARGS]…
Try “bench --help” for help.

Error: no such option: --new-site