creating a new record using association pk plugin

gistfile1.rb

params = {"user"=>{"name"=>"zxcv", "surname"=>"", "email"=>"[email protected]", "crypted_password"=>"asdfasdf", "role"=>"admin", "status"=>"active", "account_pks"=>["1"]}}
@user = User.new(params[:user])

###
error
PG::SyntaxError: ERROR:  INSERT has more target columns than expressions
LINE 1: INSERT INTO "accounts_users" ("user_id", "account_id") VALUE...

###
User Model
class User < Sequel::Model
  plugin :timestamps
  plugin :validation_helpers
  plugin :dirty
  plugin :association_pks
  plugin :forme
  many_to_many :accounts

  attr_accessor :password, :password_confirmation

  def validate
    validates_presence     :email
    validates_presence     :role
    validates_presence     :password if password_required
    validates_presence     :password_confirmation if password_required
    validates_length_range 4..40, :password unless password.blank?
    errors.add(:password_confirmation, 'must confirm password') if !password.blank? && password != password_confirmation
    validates_length_range 3..100, :email unless email.blank?
    validates_unique       :email unless email.blank?
    validates_format       /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i, :email unless email.blank?
    validates_format       /[A-Za-z]/, :role unless role.blank?
  end

  # Callbacks
  def before_save
    encrypt_password
  end

  ##
  # This method is for authentication purpose.
  #
  def self.authenticate(email, password)
    account = filter(Sequel.function(:lower, :email) => Sequel.function(:lower, email)).first
    account && account.has_password?(password) ? account : nil
  end

  ##
  # Replace ActiveRecord method.
  #
  def self.find_by_id(id)
    self[id] rescue nil
  end

  def has_password?(password)
    ::BCrypt::Password.new(self.crypted_password) == password
  end

  private

  def encrypt_password
    if self.column_changed?(:crypted_password) || !self.id
      self.crypted_password = ::BCrypt::Password.create(self.crypted_password)
    end
  end

  def password_required
    self.crypted_password.blank? || password.present?
  end
end

Sequel.migration do
  up do
    create_table :users do
      primary_key :id
      String :first_name
      String :last_name
      String :email
      String :crypted_password
      String :role
      String :user_status
      String :note
    end
  end

  down do
    drop_table :users
  end
end

Sequel.migration do
  up do
    create_table :accounts do
      primary_key :id
      Fixnum :user_id
      String :account_status
      String :account_name
      DateTime :created_at
      DateTime :updated_at
    end
  end

  down do
    drop_table :accounts
  end
end


Sequel.migration do
  up do
    create_table :accounts_users do
      Fixnum :user_id
      Fixnum :account_id
    end
  end

  down do
    drop_table :accounts_users
  end
end

ERROR - PG::SyntaxError: ERROR: INSERT has more target columns than expressions
LINE 1: INSERT INTO "accounts_users" ("user_id", "account_id") VALUE...
^: INSERT INTO "accounts_users" ("user_id", "account_id") VALUES (1)