Installing theme CLI and creating a theme

[Andrew_Rowe]

I did not want to clutter that topic but I was following this guide

Theme Developer Tutorial: 2. Creating a remote theme

In the last chapter, we created a basic theme via the Discourse admin interface. This works well enough for very simple themes. But as soon as you want to do something more complex, or share a theme more widely, you’ll need to create a Remote Theme. Install the discourse_theme CLI The first step towards developing a remote theme is to install the discourse_theme CLI on your computer. This tool is used to generate the initial scaffold for a theme, and can then synchronize it in real-time to a lo…

when I got to this step

@system

When setup is done, you’ll see ✅ Done!, and you’ll be prompted to start “watching” the theme. Answer yes, and then work through the watching setup.

instead I got

/var/lib/gems/3.0.0/gems/discourse_theme-2.1.6/lib/discourse_theme/scaffold.rb:53:in `block in generate': undefined method `safe_dump' for Psych:Module (NoMethodError)
Did you mean?  safe_load
	from /var/lib/gems/3.0.0/gems/discourse_theme-2.1.6/lib/discourse_theme/scaffold.rb:18:in `chdir'
	from /var/lib/gems/3.0.0/gems/discourse_theme-2.1.6/lib/discourse_theme/scaffold.rb:18:in `generate'
	from /var/lib/gems/3.0.0/gems/discourse_theme-2.1.6/lib/discourse_theme/cli.rb:68:in `run'
	from /var/lib/gems/3.0.0/gems/discourse_theme-2.1.6/bin/discourse_theme:6:in `<top (required)>'
	from /usr/local/bin/discourse_theme:25:in `load'
	from /usr/local/bin/discourse_theme:25:in `<main>'

did I do something wrong?

Edit: The bot said install ruby-dev if you get an error and that worked