title: undefined local variable or method `confirmed_at' for #<User:0x8f53b44>
body: <p>I know others asked this question, but the answers didn't solve my problem.</p>
  
  <p>I'm getting this error when trying the sign up feature: <code>"undefined local variable or method 'confirmed_at' for #&lt;User:0x8f53b44&gt;"</code></p>
  
  <p>My migration looks like this:</p>
  
  <pre><code>class DeviseCreateUsers &lt; ActiveRecord::Migration
    def change
      create_table(:users) do |t|
        ## Customization
        t.string :name
        ## Database authenticatable
        t.string :email,              :null =&gt; false, :default =&gt; ""
        t.string :encrypted_password, :null =&gt; false, :default =&gt; ""
  
        ## Recoverable
        t.string   :reset_password_token
        t.datetime :reset_password_sent_at
  
        ## Rememberable
        t.datetime :remember_created_at
  
        ## Trackable
        t.integer  :sign_in_count, :default =&gt; 0, :null =&gt; false
        t.datetime :current_sign_in_at
        t.datetime :last_sign_in_at
        t.string   :current_sign_in_ip
        t.string   :last_sign_in_ip
  
        ## Confirmable
        t.string   :confirmation_token
        t.datetime :confirmed_at
        t.datetime :confirmation_sent_at
        t.string   :unconfirmed_email # Only if using reconfirmable
  
        ## Lockable
        # t.integer  :failed_attempts, :default =&gt; 0, :null =&gt; false # Only if lock strategy is :failed_attempts
        # t.string   :unlock_token # Only if unlock strategy is :email or :both
        # t.datetime :locked_at
  
  
        t.timestamps
      end
  
      add_index :users, :email,                :unique =&gt; true
      add_index :users, :reset_password_token, :unique =&gt; true
      # add_index :users, :confirmation_token,   :unique =&gt; true
      # add_index :users, :unlock_token,         :unique =&gt; true
    end
  end
  </code></pre>
  
  <p>And I added <code>devise :confirmable</code> to the User model.</p>
  
  <p>What am I doing wrong? Thanks a lot!</p>