Kitchen gcp : 'gce' driver issue


I am following Learn Chef Rally with google cloud.

kitchen list gives me below error.
Could not load the 'gce' driver from the load path. Please ensure that your driver is installed as a gem or included in your Gemfile if using Bundler.

I am trying to understand issues #50 51 and 57 but not able to figure out what to do.

Someone please help me with what should be my next step.