我对编程很新，可以使用一些帮助。我一直在运行rails s $ -p $ PORT -b $ IP，它运行得很好，但现在我遇到了错误。有人可以帮忙吗？这是我在运行rails s -p $ PORT -b $ IP：
后得到的/usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.1.0/lib/active_support/values/time_zone.rb:285: warning: circular argument reference - now
/usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/psych.rb:377:in `parse': (<unknown>): did not find expected key while parsing a block mapping at line 6 column 1 (Psych::SyntaxError)
from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/psych.rb:377:in `parse_stream'
from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/psych.rb:325:in `parse'
from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/psych.rb:252:in `load'
from /usr/local/rvm/gems/ruby-2.3.0/gems/figaro-1.0.0/lib/figaro/application.rb:60:in `parse'
from /usr/local/rvm/gems/ruby-2.3.0/gems/figaro-1.0.0/lib/figaro/application.rb:56:in `block in raw_configuration'
from /usr/local/rvm/gems/ruby-2.3.0/gems/figaro-1.0.0/lib/figaro/application.rb:56:in `raw_configuration'
from /usr/local/rvm/gems/ruby-2.3.0/gems/figaro-1.0.0/lib/figaro/application.rb:64:in `global_configuration'
from /usr/local/rvm/gems/ruby-2.3.0/gems/figaro-1.0.0/lib/figaro/application.rb:32:in `configuration'
from /usr/local/rvm/gems/ruby-2.3.0/gems/figaro-1.0.0/lib/figaro/application.rb:42:in `each'
from /usr/local/rvm/gems/ruby-2.3.0/gems/figaro-1.0.0/lib/figaro/application.rb:36:in `load'
from /usr/local/rvm/gems/ruby-2.3.0/gems/figaro-1.0.0/lib/figaro.rb:23:in `load'
from /usr/local/rvm/gems/ruby-2.3.0/gems/figaro-1.0.0/lib/figaro/rails/railtie.rb:5:in `block in <class:Railtie>'
from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:45:in `block in run_load_hooks'
from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:44:in `each'
from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:44:in `run_load_hooks'
from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.1.0/lib/rails/application.rb:123:in `initialize'
from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.1.0/lib/rails/railtie.rb:171:in `new'
from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.1.0/lib/rails/railtie.rb:171:in `instance'
from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.1.0/lib/rails/application.rb:90:in `inherited'
from /home/ubuntu/workspace/simplecodecasts_saas/config/application.rb:10:in `<module:SimplecodecastsSaas>'
from /home/ubuntu/workspace/simplecodecasts_saas/config/application.rb:9:in `<top (required)>'
from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:79:in `require'
from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:79:in `block in server'
from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:76:in `tap'
from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:76:in `server'
from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.1.0/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.1.0/lib/rails/commands.rb:17:in `<top (required)>'
from /home/ubuntu/workspace/simplecodecasts_saas/bin/rails:9:in `require'
from /home/ubuntu/workspace/simplecodecasts_saas/bin/rails:9:in `<top (required)>'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.6.3/lib/spring/client/rails.rb:28:in `load'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.6.3/lib/spring/client/rails.rb:28:in `call'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.6.3/lib/spring/client/command.rb:7:in `call'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.6.3/lib/spring/client.rb:28:in `run'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.6.3/bin/spring:49:in `<top (required)>'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.6.3/lib/spring/binstub.rb:11:in `load'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.6.3/lib/spring/binstub.rb:11:in `<top (required)>'
from /home/ubuntu/workspace/simplecodecasts_saas/bin/spring:13:in `require'
from /home/ubuntu/workspace/simplecodecasts_saas/bin/spring:13:in `<top (required)>'
from bin/rails:3:in `load'
from bin/rails:3:in `<main>'