tmuxinator: Tmuxinator won't start

Tmuxinator won’t start with any command. I just installed ubuntu 16.10 on my computer and reinstalled tmuxinator. I was using it before on Fedora 25 without any problem, but now, after installing the gem, I just can’t start it. Every time I send tmuxinator, tmuxinator list or tmuxinator start personnel (which is a past yml file I was using), I get the following error message: /home/nrfrd/bin/tmuxinator:22:in '<main>': undefined method 'activate_bin_path' for Gem:Module (NoMethodError) I don’t understand why the error message point to /home/nrfrd/bin/tmuxinator; there’s no such file in my bin directory. Actually, the only file I know I have in my home related to tmuxinator are two .yml files in the .tmuxinator. I tried to reinstall tmuxinator, but I still get the same errors.