Rails - May 2014 - ActiveRecord::AssociationTypeMismatch

Sorry for my english.

I have to create twitter like app. I created 3 models User, Tweet, 
Followership

class User < ActiveRecord::Base
  has_many :tweets
  accepts_nested_attributes_for :tweets
  has_many :followerships, class_name: 'Followership', foreign_key: 
'followed_id'
  has_many :followerships, class_name: 'Followership', foreign_key: 
'follower_id'
  has_many :followed, through: :followedships, source: :followed
  has_many :followers, through: :followerships, source: :follower
end
class Tweet < ActiveRecord::Base
  belongs_to :user
end
class Followership < ActiveRecord::Base
  belongs_to :follower, class_name: 'User'
  belongs_to :followed, class_name: 'User'
end

I have *yaml* file with *UTF-8* data to add to my db. I changed my 
*seeds.rb* file in such a way:
seed_file = File.join(Rails.root, 'db', 'seeds.yml')
config = YAML::load_file(seed_file)
User.create(config["users"])
Followership.create(config["followerships"])

Then i tried to run *rake db:seed* and got 
alexkd@Active-pc:~/WebDev/rails/twitter$ rake db:seed
rake aborted!
ActiveRecord::AssociationTypeMismatch: Tweet(#97039630) expected, got 
Hash(#81744670)
...

Whats the problem? I have no ideas. *ruby 2.0, Rails 4.1.0, sQlite3*


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