I noticed that the /npc path command wasn't working, so I raised the issue to the Citizens developers through GitHub. The problem might not be with the plugin, but with Minehut.
Please fix the plugin.
The plugin Ultimate_Economy is not running on the latest version. The one on Minehut is version 1.2.5b, while the latest one here is 1.2.5e. It also displays a message in game that the plugin is not up to date.