Problems installing Foreman-GCE plugin

Hi all,

I need some help plz. I have tried to install the foreman-gce plugin and i
got an error :

Could not find gem 'google-api-client (>= 0) ruby' in the gems available on
this machine. (Bundler::GemNotFound)

then installed the gem google-api-client and reinstalled the plugin but i
have the same error.

I am running foreman 1.4.1 on an ubuntu server x64 machine.

Could someone help me out?

Thank u