rails2 を rails3 にアップグレードしましたが、db:migrate をレーキしようとすると、次のエラーが見つかりました。
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
DEPRECATION WARNING: The InstanceMethods module inside ActiveSupport::Concern will be no longer included automatically. Please define instance methods directly in ActiveSupport::Callbacks instead. (called from include at /home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/actionpack-3.2.14/lib/action_dispatch/middleware/reloader.rb:29)
** Invoke db:load_config (first_time)
** Execute db:load_config
** Execute db:migrate
rake aborted!
/home/cis/.rvm/gems/ruby-1.9.3-p392@global/gems/rake-10.1.0/lib/rake/trace_output.rb:16:in `block in trace_on': invalid byte sequence in US-ASCII (ArgumentError)
from /home/cis/.rvm/gems/ruby-1.9.3-p392@global/gems/rake-10.1.0/lib/rake/trace_output.rb:14:in `map'
from /home/cis/.rvm/gems/ruby-1.9.3-p392@global/gems/rake-10.1.0/lib/rake/trace_output.rb:14:in `trace_on'
from /home/cis/.rvm/gems/ruby-1.9.3-p392@global/gems/rake-10.1.0/lib/rake/application.rb:340:in `trace'
from /home/cis/.rvm/gems/ruby-1.9.3-p392@global/gems/rake-10.1.0/lib/rake/application.rb:187:in `display_error_message'
from /home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/gems/airbrake-3.1.14/lib/airbrake/rake_handler.rb:23:in `display_error_message_with_airbrake'
from /home/cis/.rvm/gems/ruby-1.9.3-p392@global/gems/rake-10.1.0/lib/rake/application.rb:174:in `rescue in standard_exception_handling'
from /home/cis/.rvm/gems/ruby-1.9.3-p392@global/gems/rake-10.1.0/lib/rake/application.rb:165:in `standard_exception_handling'
from /home/cis/.rvm/gems/ruby-1.9.3-p392@global/gems/rake-10.1.0/lib/rake/application.rb:75:in `run'
from /home/cis/.rvm/gems/ruby-1.9.3-p392@global/gems/rake-10.1.0/bin/rake:33:in `<top (required)>'
from /home/cis/.rvm/gems/ruby-1.9.3-p392@global/bin/rake:19:in `load'
from /home/cis/.rvm/gems/ruby-1.9.3-p392@global/bin/rake:19:in `<main>'
from /home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/bin/ruby_executable_hooks:15:in `eval'
from /home/cis/.rvm/gems/ruby-1.9.3-p392@rails3214/bin/ruby_executable_hooks:15:in `<main>'