Stacktrace of rake db:migrate

gistfile1.txt

** Invoke environment (first_time)
** Execute environment
** Invoke db:load_config (first_time)
** Execute db:load_config
** Execute db:migrate
rake aborted!
An error has occurred, this and all later migrations canceled:

Survey is not a class
/Users/cannonball/Desktop/survey/db/migrate/20121127190871_update_blank_api_ids_
on_question_group.rb:2:in `<top (required)>'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
esupport-3.2.9/lib/active_support/dependencies.rb:251:in `require'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
esupport-3.2.9/lib/active_support/dependencies.rb:251:in `block in require'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
esupport-3.2.9/lib/active_support/dependencies.rb:236:in `load_dependency'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
esupport-3.2.9/lib/active_support/dependencies.rb:251:in `require'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
erecord-3.2.9/lib/active_record/migration.rb:537:in `load_migration'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
erecord-3.2.9/lib/active_record/migration.rb:533:in `migration'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
erecord-3.2.9/lib/active_record/migration.rb:528:in `migrate'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
erecord-3.2.9/lib/active_record/migration.rb:720:in `block (2 levels) in migrate
'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
erecord-3.2.9/lib/active_record/migration.rb:775:in `call'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
erecord-3.2.9/lib/active_record/migration.rb:775:in `block in ddl_transaction'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
erecord-3.2.9/lib/active_record/connection_adapters/abstract/database_statements
.rb:192:in `transaction'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
erecord-3.2.9/lib/active_record/transactions.rb:208:in `transaction'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
erecord-3.2.9/lib/active_record/migration.rb:775:in `ddl_transaction'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
erecord-3.2.9/lib/active_record/migration.rb:719:in `block in migrate'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
erecord-3.2.9/lib/active_record/migration.rb:700:in `each'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
erecord-3.2.9/lib/active_record/migration.rb:700:in `migrate'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
erecord-3.2.9/lib/active_record/migration.rb:570:in `up'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
erecord-3.2.9/lib/active_record/migration.rb:551:in `migrate'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activ
erecord-3.2.9/lib/active_record/railties/databases.rake:179:in `block (2 levels)
 in <top (required)>'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/lib/rake/task.rb:227:in `call'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/lib/rake/task.rb:227:in `block in execute'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/lib/rake/task.rb:222:in `each'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/lib/rake/task.rb:222:in `execute'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/lib/rake/task.rb:166:in `block in invoke_with_call_chain'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/1.9.1/monitor.rb:211:
in `mon_synchronize'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/lib/rake/task.rb:159:in `invoke_with_call_chain'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/lib/rake/task.rb:152:in `invoke'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/lib/rake/application.rb:141:in `invoke_task'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/lib/rake/application.rb:99:in `block (2 levels) in top_level'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/lib/rake/application.rb:99:in `each'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/lib/rake/application.rb:99:in `block in top_level'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/lib/rake/application.rb:108:in `run_with_threads'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/lib/rake/application.rb:93:in `top_level'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/lib/rake/application.rb:71:in `block in run'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/lib/rake/application.rb:158:in `standard_exception_handling'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/lib/rake/application.rb:68:in `run'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rake-
10.0.2/bin/rake:37:in `<top (required)>'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/bin/rake:23:in `load'
/usr/local/Cellar/rbenv/0.3.0/versions/1.9.3-p194/bin/rake:23:in `<main>'
Tasks: TOP => db:migrate