Devise/Cancan Signout User On Controller Action

I have implemented Devise for Authentication and Authorization in ROR application everything seems fine but getting one issue. I have two modals "Account" and "Transactiona" , and so two controllers respectively.

My Transaction Index view call one of Account Controller method like this

$.post("accounts/our_miles_balance/?account_number="+$("#account_number").val(),function(data) {    $("#our_miles_balance").val(data); });

When this ajax post run it gives following error and sign out admin user

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Here is my Ability Class

class Ability include CanCan::Ability

def initialize(user)   user ||= # guest user   if user.role == 1 #admin     can :manage, :all     can :read, :all   elsif user.role == 2 #Vendor     can :manage, VendorTransaction     can :index, Account   end end end

Ok Here is my Transaction controller

require 'csv' class TransactionsController < ApplicationController load_and_authorize_resource helper_method :sort_column, :sort_direction

respond_to :html, :js def index   per_page = 40   @transactions =[:id]).order(sort_column + " " + sort_direction)

respond_to do |format|   format.html # index.html.erb   format.csv { render :csv => @transactions} end

AND Account Controller

class AccountsController < ApplicationController load_and_authorize_resource helper_method :sort_column, :sort_direction def index    @accounts =[:program_id]   respond_to do |format|     format.html # index.html.erb     format.json { render :json => @accounts} end

def our_miles_balance    a = Account.find_by_account_number(params[:account_number])    @miles = Account.our_miles_balance( if ?a!=nil     respond_to do |format|      format.json { render json: @miles}   end end end

What i m doing wrong here, please help....