Cannot load such file -- raindrops (LoadError)

I was clone a rails project and run bundle install.When bundle was installed the raindrops gem, shell show me an error.And I remove from gemfile.lock old version and install last version of this gem.Bundle completed successfully, but when I run rails server - shell show me another error

/home/weare138/.rvm/gems/ruby-2.2.1/gems/activesupport-3.2.16/lib/active_support/values/time_zone.rb:270: warning: circular argument reference - now
/home/weare138/.rvm/gems/ruby-2.2.1/gems/unicorn-4.7.0/lib/unicorn/worker.rb:2:in `require': cannot load such file -- raindrops (LoadError)
    from /home/weare138/.rvm/gems/ruby-2.2.1/gems/unicorn-4.7.0/lib/unicorn/worker.rb:2:in `<top (required)>'
    from /home/weare138/.rvm/gems/ruby-2.2.1/gems/unicorn-4.7.0/lib/unicorn.rb:112:in `require'
    from /home/weare138/.rvm/gems/ruby-2.2.1/gems/unicorn-4.7.0/lib/unicorn.rb:112:in `<top (required)>'
    from /home/weare138/.rvm/gems/ruby-2.2.1@global/gems/bundler-1.8.4/lib/bundler/runtime.rb:76:in `require'
    from /home/weare138/.rvm/gems/ruby-2.2.1@global/gems/bundler-1.8.4/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
    from /home/weare138/.rvm/gems/ruby-2.2.1@global/gems/bundler-1.8.4/lib/bundler/runtime.rb:72:in `each'
    from /home/weare138/.rvm/gems/ruby-2.2.1@global/gems/bundler-1.8.4/lib/bundler/runtime.rb:72:in `block in require'
    from /home/weare138/.rvm/gems/ruby-2.2.1@global/gems/bundler-1.8.4/lib/bundler/runtime.rb:61:in `each'
    from /home/weare138/.rvm/gems/ruby-2.2.1@global/gems/bundler-1.8.4/lib/bundler/runtime.rb:61:in `require'
    from /home/weare138/.rvm/gems/ruby-2.2.1@global/gems/bundler-1.8.4/lib/bundler.rb:134:in `require'
    from /home/weare138/honey/config/application.rb:7:in `<top (required)>'
    from /home/weare138/.rvm/gems/ruby-2.2.1/gems/railties-3.2.16/lib/rails/commands.rb:53:in `require'
    from /home/weare138/.rvm/gems/ruby-2.2.1/gems/railties-3.2.16/lib/rails/commands.rb:53:in `block in <top (required)>'
    from /home/weare138/.rvm/gems/ruby-2.2.1/gems/railties-3.2.16/lib/rails/commands.rb:50:in `tap'
    from /home/weare138/.rvm/gems/ruby-2.2.1/gems/railties-3.2.16/lib/rails/commands.rb:50:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

how fix it?

sorry for my bad English