Ruby ‘bundle install’ error

If you see something like:

/usr/local/lib/ruby/1.9.1/rubygems/specification.rb:519:in `normalize_yaml_input':
invalid byte sequence in US-ASCII (ArgumentError)
from /usr/local/lib/ruby/1.9.1/rubygems/specification.rb:479:in `from_yaml'
from /usr/local/lib/ruby/1.9.1/rubygems/package/tar_input.rb:183:in `load_gemspec'
from /usr/local/lib/ruby/1.9.1/rubygems/package/tar_input.rb:51:in `block in initialize'
...

when you run ‘bundle install’, do:

sudo gem update --system

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