我在digitalocean上部署我的应用程序并执行所有配置chagnes。当我访问其URL时，它会出错
504 Gateway Time-out
unicorn.log中的错误是
E, [2016-11-21T07:58:42.365353 #3882] ERROR -- : Could not find json-1.8.2 in any of the sources (Bundler::GemNotFound)
/usr/local/rvm/gems/ruby-2.2.1@global/gems/bundler-1.8.4/lib/bundler/spec_set.rb:92:in `block in materialize'
/usr/local/rvm/gems/ruby-2.2.1@global/gems/bundler-1.8.4/lib/bundler/spec_set.rb:85:in `map!'
/usr/local/rvm/gems/ruby-2.2.1@global/gems/bundler-1.8.4/lib/bundler/spec_set.rb:85:in `materialize'
/usr/local/rvm/gems/ruby-2.2.1@global/gems/bundler-1.8.4/lib/bundler/definition.rb:132:in `specs'
/usr/local/rvm/gems/ruby-2.2.1@global/gems/bundler-1.8.4/lib/bundler/definition.rb:177:in `specs_for'
/usr/local/rvm/gems/ruby-2.2.1@global/gems/bundler-1.8.4/lib/bundler/definition.rb:166:in `requested_specs'
/usr/local/rvm/gems/ruby-2.2.1@global/gems/bundler-1.8.4/lib/bundler/environment.rb:18:in `requested_specs'
/usr/local/rvm/gems/ruby-2.2.1@global/gems/bundler-1.8.4/lib/bundler/runtime.rb:13:in `setup'
nginx中的错误是
*17 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 151.241.230.107, server: _, request: "POST / HTTP/1.1", upstream: "http://unix:/var/run/unicorn.sock/", host: "www.dynaforwardclassifiedsbooster.com"