rack unable to locate thin - load error

Question

$ /usr/bin/rackup -s thin -o 0.0.0.0 -p 4000 config.ru

/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:126:in `require': cannot load such file -- thin (LoadError)
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:126:in `require'
    from /Library/Ruby/Gems/2.0.0/gems/rack-1.6.0/lib/rack/handler/thin.rb:1:in `<top (required)>'
    from /Library/Ruby/Gems/2.0.0/gems/rack-1.6.0/lib/rack/handler.rb:20:in `const_get'
    from /Library/Ruby/Gems/2.0.0/gems/rack-1.6.0/lib/rack/handler.rb:20:in `block in get'
    from /Library/Ruby/Gems/2.0.0/gems/rack-1.6.0/lib/rack/handler.rb:20:in `each'
    from /Library/Ruby/Gems/2.0.0/gems/rack-1.6.0/lib/rack/handler.rb:20:in `inject'
    from /Library/Ruby/Gems/2.0.0/gems/rack-1.6.0/lib/rack/handler.rb:20:in `get'
    from /Library/Ruby/Gems/2.0.0/gems/rack-1.6.0/lib/rack/server.rb:290:in `server'
    from /Library/Ruby/Gems/2.0.0/gems/rack-1.6.0/lib/rack/server.rb:214:in `block in logging_middleware'
    from /Library/Ruby/Gems/2.0.0/gems/rack-1.6.0/lib/rack/server.rb:327:in `call'
    from /Library/Ruby/Gems/2.0.0/gems/rack-1.6.0/lib/rack/server.rb:327:in `block in build_app'
    from /Library/Ruby/Gems/2.0.0/gems/rack-1.6.0/lib/rack/server.rb:326:in `reverse_each'
    from /Library/Ruby/Gems/2.0.0/gems/rack-1.6.0/lib/rack/server.rb:326:in `build_app'
    from /Library/Ruby/Gems/2.0.0/gems/rack-1.6.0/lib/rack/server.rb:336:in `wrapped_app'
    from /Library/Ruby/Gems/2.0.0/gems/rack-1.6.0/lib/rack/server.rb:272:in `start'
    from /Library/Ruby/Gems/2.0.0/gems/rack-1.6.0/lib/rack/server.rb:147:in `start'
    from /Library/Ruby/Gems/2.0.0/gems/rack-1.6.0/bin/rackup:4:in `<top (required)>'
    from /usr/bin/rackup:23:in `load'
    from /usr/bin/rackup:23:in `<main>'

I have thin ( gem install thin ) at : /Users/user25/.rbenv/shims/thin

where am i going wrong ? I tried to provide the absolute path to rackup but to no avail.

Answer 1

Did you run rbenv rehash after you installed the gem? You need to rehash whenever you add new shims.