How can I import/export settings into a file?

Hello,

I’ve used discourse-settings-uploader to upload site_settings.json file from the GitHub Jay mentioned. I get this error when I run it:

./discourse-settings-uploader:39:in `<main>': undefined method `each' for nil:NilClass (NoMethodError)

line39: settings['site_settings'].each do |setting|
line40:  jsetting (setting) unless setting['value'] == setting['default']
line41: end

I used an API key for “All Users” and used “system” when I ran discourse-settings-uploader.
Any thoughts?