为什么bundle exec puma失败并显示Gemfile语法错误？

Question

I'm trying to deploy a Rails 4 app with capistrano 3 to Ubuntu 12.04. I'm using the capistrano3-puma gem to handle configuring puma, but when it tries to bundle exec puma I get this error:

Gemfile syntax error: (Bundler::GemfileError)
/srv/photo_album/releases/20140607043918/Gemfile:41: syntax error, unexpected ':', expecting kEND
...sprockets_better_errors', git: 'git@github.com:RobinClowers/...

I'm able bundle exec rails just fine from this machine just fine, so I think there is something else going on. That error looks like ruby 1.8 trying to parse 1.9 hash syntax...

Answer 1

I figured this out. I accidentally installed puma with the system ruby (which is 1.8.7), and I had not run bundle install yet, so there was no 2.1.1 version install for it to find.