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Getting NoMethodError (undefined `name 'method for nil: NilClass) when creating a new model in Heroku console

I just did a push to Heroku and tried to do some tests by adding a model through rails_admin. When I did this, I got a common error page. I went into the logs and noticed this message:

NoMethodError (undefined name method for nil: NilClass)

Then I opened the heroku console and tried to add the model manually and received the same message when trying to save.

NoMethodError: undefined name method for nil: NilClass

Here is the model:

class Board < ActiveRecord::Base
  attr_accessible :name, :description

  validates :name, :presence => true
  validates :description, :presence => true
  validates_uniqueness_of :name, :case_sensitive => false

  has_many :subjects
  scope :hidden, where(:is_hidden => true)
  scope :visible, where(:is_hidden => false)
end

Any ideas what might happen to this - or where to start looking?

I migrated and was able to see that he recognized the model and its attributes when working in the console.

Thank!

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