ruby on rails - ERROR: Could not find a valid gem 'buftok' (>= 0), here is why:

When I run my command ruby tweet.rb I get this error:

/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/dependency.rb:296:in `to_specs': Could not find 'buftok' (~> 0.2.0) among 169 total gem(s) (Gem::LoadError)                                                                              
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:1209:in `block in activate_dependencies'                                                                   
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:1198:in `each'                                                                   
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:1198:in `activate_dependencies'                                                                   
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/specification.rb:1180:in `activate'                                                                   
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems.rb:186:in `rescue in try_activate'                                                                                                                                      
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems.rb:183:in `try_activate'                                                                                                                                      
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:132:in `rescue in require'                                                                   
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:144:in `require'                                                                                                                                      
    from tweet.rb:2:in `<main>'

I think this is a known bug in obsolete (2.0.*) versions of RubyGems. I‘ve updated to the latest RubyGems version: gem update --system but how do I or do I then re-run the gem installation of ALL gems?

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ruby on rails - ERROR: Could not find a valid gem 'buftok' (>= 0), here is why: - Stack Overflow

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