Ruby on Rails

Hi everyone, new to the group, new to programing and most certainly new to RoR (so forgive me if this questions is stupid)

Last week I started to take the RoR course at onemonthrails.com and I've been stuck on Adding Bootstrap lesson since last week. Every time I run 'bundle install' after adding the bootstrap-sass Gem to the Gemfile I get:

Installing bootstrap-sass (2.3.2.1)
Errno::EACCES: Permission denied - /Users/Diego/.rvm/gems/ruby-2.0.0-p247/bin/ruby_noexec_wrapper
An error occurred while installing bootstrap-sass (2.3.2.1), and Bundler cannot continue.
Make sure that `gem install bootstrap-sass -v '2.3.2.1'` succeeds before bundling.

When I look in:
/Users/Diego/.rvm/gems/ruby-2.0.0-p247/bin/ruby_noexec_wrapper
and do: ls -a
I don't see the ruby_noexec_wrapper file

GitHub rep at: https://github.com/dschmunis/omrails

I've spent countless hours googling the issue and reading post on Stackoverflow but can't find a solution and haven't gotten any responses on the course's Comments page.

I don't want to give up on RoR or the course as I was starting to feel good with my progress and what I was learning, but unless I'm able to get past this spot I don't know what else to do/try.

Can any one please help?

Best,
Diego