I am getting this Error when I try to install the Extension:
Your requirements could not be resolved to an installable set of packages.
Problem 1
- Installation request for fof/nightmode ^0.3.0 -> satisfiable by fof/nightmode[0.3.0].
- fof/nightmode 0.3.0 requires flarum/core ^0.1.0-beta.8 -> satisfiable by flarum/core[0.1.x-dev, v0.1.0-beta.10, v0.1.0-beta.8, v0.1.0-beta.8.1, v0.1.0-beta.8.2, v0.1.0-beta.9] but these conflict with your requirements or minimum-stability.
Installation failed, deleting ./composer.json.
Image:

(Flarum 0.1.0-beta.10)