Error running rake db:migrate with rails 3.1

gistfile1.txt

alex@manfred:~/projectes/brandchats$ rake db:migrate --trace
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/webbynode-1.0.4.3/lib/webbynode/io.rb:14: Use RbConfig instead of obsolete and deprecated Config.
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
rake aborted!
can't convert nil into Hash
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:217:in `merge!'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:217:in `block in revive_hash'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:211:in `each'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:211:in `each_slice'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:211:in `revive_hash'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:123:in `visit_Psych_Nodes_Mapping'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/visitor.rb:15:in `visit'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/visitor.rb:5:in `accept'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:16:in `accept'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:226:in `block in revive_hash'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:211:in `each'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:211:in `each_slice'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:211:in `revive_hash'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:123:in `visit_Psych_Nodes_Mapping'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/visitor.rb:15:in `visit'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/visitor.rb:5:in `accept'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:16:in `accept'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych/nodes/node.rb:35:in `to_ruby'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/psych.rb:113:in `load'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/railties-3.1.0/lib/rails/application/configuration.rb:100:in `database_configuration'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/activerecord-3.1.0/lib/active_record/railtie.rb:68:in `block (2 levels) in <class:Railtie>'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/activesupport-3.1.0/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/activesupport-3.1.0/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/activesupport-3.1.0/lib/active_support/lazy_load_hooks.rb:26:in `on_load'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/activerecord-3.1.0/lib/active_record/railtie.rb:67:in `block in <class:Railtie>'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/railties-3.1.0/lib/rails/initializable.rb:25:in `instance_exec'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/railties-3.1.0/lib/rails/initializable.rb:25:in `run'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/railties-3.1.0/lib/rails/initializable.rb:50:in `block in run_initializers'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/railties-3.1.0/lib/rails/initializable.rb:49:in `each'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/railties-3.1.0/lib/rails/initializable.rb:49:in `run_initializers'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/railties-3.1.0/lib/rails/application.rb:92:in `initialize!'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/railties-3.1.0/lib/rails/railtie/configurable.rb:30:in `method_missing'
/home/alex/projectes/brandchats/config/environment.rb:5:in `<top (required)>'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:240:in `require'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:240:in `block in require'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:223:in `block in load_dependency'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:640:in `new_constants_in'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:223:in `load_dependency'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:240:in `require'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@brandchats/gems/railties-3.1.0/lib/rails/application.rb:189:in `block (2 levels) in initialize_tasks'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/task.rb:205:in `call'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/task.rb:205:in `block in execute'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/task.rb:200:in `each'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/task.rb:200:in `execute'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/task.rb:176:in `block in invoke_prerequisites'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/task.rb:174:in `each'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/task.rb:174:in `invoke_prerequisites'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/task.rb:157:in `block in invoke_with_call_chain'
/home/alex/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/task.rb:144:in `invoke'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/application.rb:112:in `invoke_task'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/application.rb:90:in `block (2 levels) in top_level'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/application.rb:90:in `each'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/application.rb:90:in `block in top_level'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/application.rb:84:in `top_level'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/application.rb:62:in `block in run'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/lib/rake/application.rb:59:in `run'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/gems/rake-0.9.2/bin/rake:32:in `<top (required)>'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/bin/rake:19:in `load'
/home/alex/.rvm/gems/ruby-1.9.3-preview1@global/bin/rake:19:in `<main>'
Tasks: TOP => db:migrate => environment

Add this code on config/boot.rb

require 'yaml'
YAML::ENGINE.yamler = 'syck'

not comming sir give me another way

not comming sir give me another way