Mine

RuntimeError (not null field with null value in class Momomoto::Person_travel field fee_currency_id in insert):
    /lib/momomoto/base.rb:500:in `insert'
    /lib/momomoto/base.rb:492:in `each'
    /lib/momomoto/base.rb:492:in `insert'
    /lib/momomoto/base.rb:387:in `write'
    /app/controllers/submission_controller.rb:82:in `save_person'
    /lib/momomoto/base.rb:432:in `transaction'
    /app/controllers/submission_controller.rb:50:in `save_person'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in `send'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in `perform_action_without_filters'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:368:in `perform_action_without_benchmark'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in `perform_action_without_rescue'
    /usr/local/lib/ruby/1.8/benchmark.rb:293:in `measure'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in `perform_action_without_rescue'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/rescue.rb:82:in `perform_action'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in `send'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in `process_without_filters'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:377:in `process_without_session_management_support'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/session_management.rb:117:in `process'
    /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in `dispatch'
    /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/fcgi_handler.rb:150:in `process_request'
    /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/fcgi_handler.rb:54:in `process!'
    /usr/local/lib/ruby/site_ruby/1.8/fcgi.rb:600:in `each_cgi'
    /usr/local/lib/ruby/site_ruby/1.8/fcgi.rb:597:in `each'
    /usr/local/lib/ruby/site_ruby/1.8/fcgi.rb:597:in `each_cgi'
    /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/fcgi_handler.rb:53:in `process!'
    /usr/local/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/fcgi_handler.rb:23:in `process!'
    /public/dispatch.fcgi:34