title: Error on DB:Migrate "uninitialized constant DeviseCreateUsers"
body: <p>I'm trying to run the rake db:migrate command on Heroku and I'm running into this problem. </p>
  
  <pre><code>    uninitialized constant DeviseCreateUsers
  /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.11/lib/active_support/inflector/methods.rb:230:in `block in constantize'
  /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.11/lib/active_support/inflector/methods.rb:229:in `each'
  /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.11/lib/active_support/inflector/methods.rb:229:in `constantize'
  /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.11/lib/active_support/core_ext/string/inflections.rb:54:in `constantize'
  /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:538:in `load_migration'
  /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:533:in `migration'
  /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:528:in `migrate'
  /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:720:in `block (2 levels) in migrate'
  /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:775:in `call'
  /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:775:in `block in ddl_transaction'
  /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction'
  /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/transactions.rb:208:in `transaction'
  /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:775:in `ddl_transaction'
  /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:719:in `block in migrate'
  /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:700:in `each'
  /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:700:in `migrate'
  /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:570:in `up'
  /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:551:in `migrate'
  /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/railties/databases.rake:179:in `block (2 levels) in &lt;top (required)&gt;'
  </code></pre>
  
  <p>Here is the fulltext of my Devise Create Users Method that appears to be causing this problem. </p>
  
  <pre><code>class AddDeviseToCustomers &lt; ActiveRecord::Migration
  def self.up
  change_table(:customers) do |t|
    ## 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
    t.datetime :current_sign_in_at
    t.datetime :last_sign_in_at
    t.string   :current_sign_in_ip
    t.string   :last_sign_in_ip
      t.string   :confirmation_token
    t.datetime :confirmed_at
    t.datetime :confirmation_sent_at
  
    ## Confirmable
  
    #t.string   :unconfirmed_email # Only if using reconfirmable
  
    ## Lockable
    # t.integer  :failed_attempts, :default =&gt; 0 # Only if lock strategy is :failed_attempts
    # t.string   :unlock_token # Only if unlock strategy is :email or :both
    # t.datetime :locked_at
  
    ## Token authenticatable
    # t.string :authentication_token
  
  
    # Uncomment below if timestamps were not included in your original model.
    # t.timestamps
  
      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
      # add_index :users, :authentication_token, :unique =&gt; true
    end
  end
  end
  </code></pre>
  
  <p>This all on a pgsql server on heroku.
  Thanks in Advance</p>