Heroku "Something Went Wrong" when trying to create a new form

I am trying to make a form that will create a new 'room'. However, when I push it to Heroku I am getting this error: 'We're sorry, but something went wrong.' I am using rails 4.1 and ruby 2.1.1. I am also using Heroku.

If it helps, I am kind of new to rails and am trying to port what I learned here to my new 'rooms' type.

This is my view/model/controller:

view: (app/views/rooms/index.html.erb)

<% if current_user %>
  <h1>Create Room</h1>
  <div class="Sign_Form">
    <%= form_for(:room, :url => {:controller => 'rooms', :action => 'create'}) do |f| %>
      <p> Created By:</br> <%= f.text_field :created_by%> </p>
      <p> Name:</br> <%= f.text_field :name%> </p>
      <p> Description:</br> <%= f.text_field :description%> </p>
      <%= f.submit :Createroom %>
    <% end %>
    <% if @room.errors.any? %>
      <ul class="Createroom_Errors">
        <% for message_error in @room.errors.full_messages %>
          <li>* <%= message_error %></li>
        <% end %>
      </ul>
    <% end %>
  </div>

  <h1>All Rooms</h1>
  <% if @rooms.nil? %>
    Rooms is nil
  <% else %>
    <% @rooms.each do |room| %>
      <%= room.name %>
    <% end %>
  <% end %>
<% else %>
  <%= render 'welcome' %>
<% end %>

Model: (app/model/room.rb)

class Room < ActiveRecord::Base
  class << self
  end
end

Controller: (app/controllers/rooms_controller.rb)

class RoomsController < ApplicationController
  def index
    @rooms = Room.all
  end

  def new
    @room = Room.new
  end

  def create
    @room = Room.new(params[:room])
    if @room.save
      flash[:notice] = "Room has been created!"
      flash[:color] = "valid"
    else
      flash[:notice] = "Room has not been created!"
      flash[:color] = "invalid"
    end
    render new
  end
end

Any help would be highly appreciated. Thanks ahead of time.

EDIT: When I run it on localhost it says: undefined method `errors' for nil:NilClass.