"No preset version installed" error while using mruby

**Complete log:**
```sh
No preset version installed for command ruby2d
Please install a version by running one of the following:

asdf install ruby mruby-3.0.0

or add one of the following versions in your config file at /home/ashvith/Documents/ruby2d/.tool-versions
ruby 3.1.1
```
I've also tried `asdf reshim`, and even restarted my shell, but it won't work. One thing that I've noticed, is that when I start with a fresh installation of asdf-ruby, without any Ruby installed, it throws a build error. MRuby only builds when vanilla Ruby is installed.