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Started GET "/" for 192.168.16.208 at Thu Aug 02 09:58:02 +0200 2012
  Processing by ExamsController#new as HTML
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   (0.2ms)  BEGIN
   (0.5ms)  UPDATE `users` SET `last_request_at` = '2012-08-02 07:58:02', `updated_at` = '2012-08-02 07:58:02', `perishable_token` = 'xHha1gKceeX1sawcGMs' WHERE `users`.`id` = 1
   (1.8ms)  COMMIT
  User Load (0.6ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 LIMIT 1
   (0.2ms)  BEGIN
   (0.6ms)  UPDATE `users` SET `last_request_at` = '2012-08-02 07:58:02', `updated_at` = '2012-08-02 07:58:02', `perishable_token` = 'yPqqJME5pZ3IsbHgJDwd' WHERE `users`.`id` = 1
   (14.8ms)  COMMIT
  Category Load (0.4ms)  SELECT `categories`.* FROM `categories`
   (0.2ms)  SELECT COUNT(*) FROM `questions` WHERE `questions`.`category_id` = 1
   (0.3ms)  SELECT COUNT(*) FROM `questions` WHERE `questions`.`category_id` = 2
   (0.2ms)  SELECT COUNT(*) FROM `questions` WHERE `questions`.`category_id` = 3
   (0.3ms)  SELECT COUNT(*) FROM `questions` WHERE `questions`.`category_id` = 4
   (0.3ms)  SELECT COUNT(*) FROM `questions` WHERE `questions`.`category_id` = 5
   (0.2ms)  SELECT COUNT(*) FROM `questions` WHERE `questions`.`category_id` = 6
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  Setting Load (0.2ms)  SELECT `settings`.* FROM `settings` WHERE `settings`.`name` = 'exams_factor_ok' LIMIT 1
Completed 500 Internal Server Error in 294ms

NoMethodError (You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.[]):
  app/models/setting.rb:21:in `value='
  app/models/setting.rb:61:in `new'
  app/models/setting.rb:61:in `find_or_default'
  app/models/setting.rb:27:in `[]'
  app/models/setting.rb:53:in `exams_factor_ok'
  app/controllers/exams_controller.rb:26:in `new'

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