ruby on rails - Why I am getting "uninitialized constant ApplicationController::SessionHelper" error? -

i don't have session model though, user , task ones.

app/helpers/sessions_helper.rb

module sessionshelper    def sign_in(user)     session[:user_id] = user.id     self.current_user = user   end    def current_user=(user)     @current_user = user   end    def current_user     if session[:user_id]     @current_user ||= user.find(session[:user_id])     end   end    def signed_in?     !current_user.nil?   end    def sign_out     session[:user_id] = nil     self.current_user = nil   end    def current_user?(user)     user == current_user   end    def deny_access     redirect_to signin_path, notice: "please sign in access page."   end  end 

i included sessionhelper in application controller.

app/controllers/application_controller.rb

class applicationcontroller < actioncontroller::base   protect_from_forgery with: :exception   include sessionhelper end 

app/models/user.rb

class user < activerecord::base  has_many :tasks    attr_accessor :password   email_regex = /\a[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i   validates :first_name, presence: true,             length: {maximum: 20}   validates :last_name,  presence: true,             length: {maximum: 40}   validates :email, presence: true,             format: {with: email_regex},             uniqueness:  {case_sensitive: false}   validates :password, presence: true,             confirmation: true,             length: {within: 6..40}    before_save :encrypt_password    def has_password?(submitted_password)     encrypted_password == encrypt(submitted_password)   end    def self.authenticate(email, submitted_password)     user = find_by_email(email)      return nil if user.nil?     return user if user.has_password?(submitted_password)   end    private     def encrypt_password       self.salt = digest::sha2.hexdigest("#{time.now.utc}--#{password}") if self.new_r        self.encrypted_password = encrypt(password)     end      def encrypt(pass)       digest::sha2.hexdigest("#{self.salt}--#{pass}")     end    end 

what's problem can be?

there's typo, should sessionshelper , not sessionhelper

 include sessionshelper 

hope helps!