I'm getting the same issue, it seems to be after step 1 in "3.Controller"
The "rails generate controller Pages" command fails, spits out a long error beginning with,
/home/ccuser/.gem/ruby/2.3.0/gems/activesupport-4.1.1/lib/active_support/values/time_zone.rb:285: warning: circular argument reference - now
/home/ccuser/.gem/ruby/2.3.0/gems/tzinfo-1.2.2/lib/tzinfo/data_source.rb:182:in `rescue in create_default_data_source': No source of
timezone data could be found. (TZInfo::DataSourceNotFound)
In addition, I've tried reloading, and installed Firefox specifically to test this. Same issue across browsers/sessions
Hope that helps.