@Aragon-Burner oh I thought you were developing a plugin and couldn't load the plugin page on the ACP. Looks like you are having trouble loading the /admin/extend/plugins page.
Can you load /admin/development/info? If so can you post a screenshot of that page.
@Arachnibot should note you need to manually install with npm link, and configure via editing the plugin initialization right now, but its technically functional.