Ruby on rails 找不到RubyGem i18n

我对Rails和Ruby比较陌生，但是当我尝试使用Rails-s或Rails-v时，我会遇到这个错误

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:777:in `report_activate_error': Could not find RubyGem i18n (>= 0.6.4, ~> 0.6) (Gem::LoadError)
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:211:in `activate'
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:246:in `activate'
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:245:in `each'
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:245:in `activate'
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:246:in `activate'
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:245:in `each'
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:245:in `activate'
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:1056:in `gem'
from /usr/local/rvm/gems/ruby-2.1.1/bin/rails:22
from /usr/local/rvm/gems/ruby-2.1.1/bin/ruby_executable_hooks:15

不知道是什么原因造成的，也不知道我如何修复它

编辑

尝试bundle安装后，出现以下错误：

Gemfile syntax error compile error
on line 73: syntax error, unexpected ':', expecting $end
gem 'thin', group: [:production]
              ^

我的文件中的第73行

编辑2

---

语法已关闭。就用这个

group :production do
  gem 'thin'
end

---

尝试

捆绑安装

。您的

文件中有语法错误

。发帖这

gem'thin'，：group=>：production

gem'thin'，group:[：production]

对我有效。前后是什么？您是否正确安装了rvm？堆栈跟踪引用了ruby 1.8，这似乎是错误的，但仍然会引发语法错误。我在上面添加了gem文件。我可以看到整个gem文件吗？

group :production do
  gem 'thin'
end