Why am I getting a "Could not find table 'users'" error?

I'm relatively new to Rails and I've been getting the above error whenever I'm testing my login page. Here's the test view file:

<%= form_for :user, :url => create_path do |f| %>
  <p> Email: <br />  <%= f.text_field :email %></p>
  <p> Password: <br />  <%= f.password_field :password %></p>
  <p><%= submit_tag "Sign In", :disable_with => "Please wait...", :class => "btn primary" %></p>
<% end %>

Here's the Users controller:

class UsersController < ApplicationController   
  before_filter :get_开发者_如何学Cuser, :except => [:register, :login, :create]
  before_filter :user_signed_in?, :only => [:delete]

  def create
    if user = User.find_by_email(params[:user][:email]).try(:authenticate, params[:user][:password])
      session[:user_id] = user.id
      redirect_to root_path # Or whatever you want i.e. redirect_to user
    else
      render :new, :flash => { :error => "Bad email/password combination" }
    end
  end

  def delete
    session.delete(:user_id)
  end

  def register
    if Invite.find_by_hash(params[:hash]).blank?
      redirect_to root_path
      return
    end
    @user = User.new(params[:user])
    if(request.post? and @user.save)
      flash[:notice] = "Account Created Successfully"
      redirect_to root_path      
      return
    else
      flash.now[:warning] = @user.errors.full_messages
    end
  end

  def destroy
    @user = User.find(params[:id])
    @user.destroy
    redirect_to root_path
  end

  def login

  end

  def get_user
    @user = User.find(params[:id])
  end

end

And my User model:

class User < ActiveRecord::Base
  has_secure_password
  validates :email, :presence => true, :uniqueness => true, :length => {:minimum => 6}
  validates_format_of :email, :with => /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i
  validates :name, :presence => true, :length => {:maximum => 32}
  validates :password, :presence => true, :length => {:minimum => 8}
  validates :username, :presence => true, :length => {:maximum => 20}, :uniqueness => true
  validates :blog, :uniqueness => true
  has_many :posts
end

The exact error I'm getting is this:

ActiveRecord::StatementInvalid in UsersController#create
Could not find table 'users'

P.S.: I'm running Rails 3.1.0.rc8. Any help would be appreciated. Thanks.

UPDATE: I can't seem to find any table. I just upgraded to Rails 3.1, everything was fine before that.

---

If you have just upgraded to Rails 3.1 and everything was working before the upgrade, check your database.yml configuration. I doubt if the configuration has gone back to the defaults because of the upgrade.

If not, follow Rajkamal's suggestion and make sure you run the migrations.