Error Page with Admin/Login update

I tried logging in and updating the admin and login plugins, but it returned a “One of the required plugins is missing or not enabled” error. So I tried going through the CLI and found out that forms wasnt installing as a dependency (it kept saying “Installation aborted”). So I manually installed the forms plugin and now I get an just a 404 Error page when I go to where the admin login page would be.

Any ideas?