I'm stuck! Getting NoMethodError in UserFriendhsipsController

 class UserFriendshipsController < ApplicationController
   before_filter :authenticate_user!
   respond_to :html, :json

   def index
     @user_Friendships = current_user.user_friendships.all
   end   

   def accept
     @user_friendship = current_user.user_friendships.find(params[:id])
     if @user_friendship.accept_mutual_friendship!
     @user_friendship.friend.user_friendships.find_by(friend_id:   current_user.id).accept_mutual_friendship!
     flash[:success] = "You are now friends with #{@user_friendship.friend.name}"
     redirect_to user_friendships_path
     else
     flash[:error] = "That friendship could not be accepted"
     end
   end

   def new
     if params[:friend_id]
       @friend = User.find(params[:friend_id])
       raise ActiveRecord::RecordNotFound if @friend.nil?
       @user_friendship = current_user.user_friendships.new(friend: @friend)
     else
  flash[:error] = "Friend required"
    end
   rescue ActiveRecord::RecordNotFound
     render file: 'public/404', status: :not_found
   end

   def create
     if params[:user_friendship] && params[:user_friendship].has_key?(:friend_id)
    @friend = User.find(params[:user_friendship][:friend_id])
    @user_friendship = UserFriendship.request(current_user, @friend)
    respond_to do |format|
    if @user_friendship.new_record?
      format.html do
        flash[:error] = "There was a problem creating this friend request."
        redirect_to user_path(@friend)
      end
      format.json { render json: @user_friendship.to_json, status: :precondition_failed }
    else
        format.html do
          flash[:success] = "Friend request sent."
          redirect_to user_path(@friend)
        end
        format.json { render json: @user_friendship.to_json }
        end
      end
   else
    flash[:error] = "Friend required"
    redirect_to root_path
   end
  end


 def edit
  @friend = User.where(user: params[:id])
  @user_friendship = current_user.user_friendships.where(friend_id:    @friend.id).decorate
 end

  def destroy
   @user_friendship = current_user.user_friendships.find(params[:id])
  if @user_friendship.destroy
  flash[:success] = "Your friendship was deleted"
  end  
   redirect_to user_friendships_path
  end

 def user_friendship
  params.require(:user_friendship).permit(:user_id, :friend_id, :user, :friend, :state, :user_friendship)
  end    
 end

 class UserFriendship < ActiveRecord::Base
    belongs_to :user
    belongs_to :friend, class_name: 'User', foreign_key: 'friend_id'

     after_destroy :delete_mutual_friendship!

     state_machine :state, initial: :pending do

     after_transition on: :accept, do: [:send_acceptance_email, :accept_mutual_friendship!]

     state :requested

       event :accept do
        transition any => :accepted
       end
    end

 $(document).ready(function() {

$('#add-friendship').click(function(event) {
    event. preventDefault();
    var addFriendshipBtn = $(this);
    $.ajax({
        url: Routes.user_friendships_path({user_friendship: { friend_id:    addFriendshipBtn.data('friendId') }}), 
        dataType: 'json',
        type: 'POST',
        success: function(e) {
            addFriendshipBtn.hide();
            $('#friend-status').html("<a href='#' class='btn btn-success'>Friendship Requested</a>");
        }

    });
     });


  });