How to specify custom-addon directory in Odoo 13?

Question

I'm following the book for self learning. And I came to this step

To add the new addons directory to the Odoo server addons path, change the current directory, and start the server with the appropriate addons path configuration:

This is what I entered into the Ubuntu Terminal:

$ cd ~/odoo-dev
$ ./odoo/odoo-bin -d todo --addons-path="custom-addons,odoo/addons" --save

However, it returns this error:

odoo-bin: error: option --addons-path: the path 'custom-addons' is not a valid addons directory

Things I have tried: I'm sure that I created the directory "custom-addons" in ~/odoo-dev The screenshot below is my current Ubuntu directory structure:

My software version: Odoo version 13;

Ubuntu 19

Answer 1

I found what is wrong, we actually have to store a working module in the directory before run the command.