Unable to find Mozilla geckodriver Please download the server from and place it somewhere on your PATH

Since Firefox 48, they have updated their system to use Geckodriver. This is a small file that helps Selenium communicate with the browser.

1. Download the lastest geckodriver version at: https://github.com/mozilla/geckodriver/releases
2. Unpack the download and add the file to your PATH

For windows users: The folder C:\Ruby\bin is already included in your PATH, so simply add the file there.

Done!