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Avatar link appears broken

I am on the adding avatars lesson, when I add an image tag after the file_field to show the image, it appears broken on the page when I try to upload an image (I am using rails 4).

#views/devise/registrations.edit.html.erb file:

<div class="form-group">
    <%= f.label :avatar %>
    <%= f.file_field :avatar, class: "form-control" %>
    <%= image_tag @user.avatar.url(:thumb) %>

#user model:                                                                                                                                                               

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
     :recoverable, :rememberable, :trackable, :validatable

has_many :logs

has_attached_file :avatar, :styles => { :medium => "300x300>", :thumb => "100x100>" }

validates :name, presence: true

validates :username, presence: true

#Database migration:
                                                                                                                                            class AddAvatarToUsers < ActiveRecord::Migration
   def self.up
    add_attachment :users, :avatar

  def self.down
    remove_attachment :users, :avatar