Based on an answer I found at https://github.com/refinery/refinerycms/issues/2450, add this to your Gemfile:
gem 'globalize3', '0.3.0'
and run
bundle install
if this fails you may need to do as the error output suggests, and run
bundle update globalize3
You may need to delete and recreate your databases via
$ rm db\*.sqlite3
$ rake db:migrate db:seed
This fixed the problem for me.