Building Sync Gem Error

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Greetings, I successfully installed the gem and I'm trying to run the example files.

Here's how things look in my Terminal.

user@mac ~ % cd /Users/user/Downloads/BuildingSync-gem-examples-develop
user@mac BuildingSync-gem-examples-develop % bundle exec ruby run_L000.rb
Traceback (most recent call last):
5: from run_L000.rb:1:in `<main>'
4: from run_L000.rb:1:in `require'
3: from /Users/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/buildingsync-0.2.0/lib/buildingsync/translator.rb:42:in `<top (required)>'
2: from /Users/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/buildingsync-0.2.0/lib/buildingsync/translator.rb:42:in `require_relative'
1: from /Users/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/buildingsync-0.2.0/lib/buildingsync/model_articulation/spatial_element.rb:39:in `<top (required)>'
/Users/user/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/buildingsync-0.2.0/lib/buildingsync/model_articulation/spatial_element.rb:39:in `require': **cannot load such file -- openstudio (LoadError)**

Is this an issue in my usage? Is it something wrong with the gem? This error also appeared when I tried my own files. It seems it's not getting past the 'require' line. Any information will help, thanks!