incompatible library version

When I try to launch rails server I get the following output, and the server doesn't open. New to both ruby and rails.

/Users/Seth/.rvm/gems/ruby-2.2.4/gems/json-1.8.3/lib/json/ext.rb:13:in require': incompatible library version - /Users/Seth/.rvm/gems/ruby-2.2.4/gems/json-1.8.3/lib/json/ext/parser.bundle (fatal) from /Users/Seth/.rvm/gems/ruby-2.2.4/gems/json-1.8.3/lib/json/ext.rb:13:in' from /Users/Seth/.rvm/gems/ruby-2.2.4/gems/json-1.8.3/lib/json/ext.rb:12:in <module:JSON>' from /Users/Seth/.rvm/gems/ruby-2.2.4/gems/json-1.8.3/lib/json/ext.rb:9:in' from /Users/Seth/.rvm/gems/ruby-2.2.4/gems/json-1.8.3/lib/json.rb:58:in require' from /Users/Seth/.rvm/gems/ruby-2.2.4/gems/json-1.8.3/lib/json.rb:58:in' from /Users/Seth/.rvm/gems/ruby-2.2.4/gems/json-1.8.3/lib/json.rb:54:in <top (required)>' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/activesupport-4.2.6/lib/active_support/core_ext/object/json.rb:2:inrequire' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/activesupport-4.2.6/lib/active_support/core_ext/object/json.rb:2:in <top (required)>' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/activesupport-4.2.6/lib/active_support/core_ext/object.rb:12:inrequire' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/activesupport-4.2.6/lib/active_support/core_ext/object.rb:12:in <top (required)>' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails/configuration.rb:2:inrequire' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails/configuration.rb:2:in <top (required)>' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails/railtie.rb:2:inrequire' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails/railtie.rb:2:in <top (required)>' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails/engine.rb:1:inrequire' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails/engine.rb:1:in <top (required)>' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails/application.rb:7:inrequire' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails/application.rb:7:in <top (required)>' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails.rb:11:inrequire' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails.rb:11:in <top (required)>' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails/commands/server.rb:4:inrequire' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails/commands/server.rb:4:in <top (required)>' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:123:inrequire' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:123:in require_command!' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:73:inserver' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:39:in run_command!' from /Users/Seth/.rvm/gems/ruby-2.2.4@global/gems/railties-4.2.6/lib/rails/commands.rb:17:in' from /Users/Seth/railsbridge/test_app/bin/rails:9:in require' from /Users/Seth/railsbridge/test_app/bin/rails:9:in' from /Users/Seth/.rvm/gems/ruby-2.2.4/gems/spring-1.7.1/lib/spring/client/rails.rb:28:in load' from /Users/Seth/.rvm/gems/ruby-2.2.4/gems/spring-1.7.1/lib/spring/client/rails.rb:28:incall' from /Users/Seth/.rvm/gems/ruby-2.2.4/gems/spring-1.7.1/lib/spring/client/command.rb:7:in call' from /Users/Seth/.rvm/gems/ruby-2.2.4/gems/spring-1.7.1/lib/spring/client.rb:30:inrun' from /Users/Seth/.rvm/gems/ruby-2.2.4/gems/spring-1.7.1/bin/spring:49:in <top (required)>' from /Users/Seth/.rvm/gems/ruby-2.2.4/gems/spring-1.7.1/lib/spring/binstub.rb:11:inload' from /Users/Seth/.rvm/gems/ruby-2.2.4/gems/spring-1.7.1/lib/spring/binstub.rb:11:in <top (required)>' from /Users/Seth/railsbridge/test_app/bin/spring:13:inrequire' from /Users/Seth/railsbridge/test_app/bin/spring:13:in <top (required)>' from bin/rails:3:inload' from bin/rails:3:in `'