Rails - Sep 2013 - TypeError: no implicit conversion of Symbol into Hash when submitting form to upload files

I''m currently new to Rails and Ruby and I''m trying to learn
from my
mistakes, this time I''m trying to upload 2 files from a form for later 
processing, however, after I hit the "Submit" button. I keep getting
this
error:

TypeError in UploadFilesController#create

app/controllers/upload_files_controller.rb:28:in `new''
app/controllers/upload_files_controller.rb:28:in `create''

Request

Parameters:

{"utf8"=>"✓",
 "authenticity_token"=>"2JJGtRXjWCZlPNhQdx6wOW4xvTseiRaXNylnUYvA5v4=",
 "upload_files"=>{"inventory"=>#<ActionDispatch::Http::UploadedFile:0x2fd8940
@original_filename="1_Inventory.xlsx",
 @content_type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
 @headers="Content-Disposition: form-data;
name=\"upload_files[inventory]\";
filename=\"1_Inventory.xlsx\"\r\nContent-Type:
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet\r\n",
 @tempfile=#<Tempfile:C:/Users/V80042~1/AppData/Local/Temp/RackMultipart20130930-9236-qiqijn>>,
 "material_list"=>#<ActionDispatch::Http::UploadedFile:0x2fe3cf8
@original_filename="2_Material_List.xlsx",
 @content_type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
 @headers="Content-Disposition: form-data;
name=\"upload_files[material_list]\";
filename=\"2_Material_List.xlsx\"\r\nContent-Type:
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet\r\n",
 @tempfile=#<Tempfile:C:/Users/V80042~1/AppData/Local/Temp/RackMultipart20130930-9236-g22588>>},
 "commit"=>"Upload"}

My upload_files_controller:

 class UploadFilesController < ApplicationController
     def new
        @uploadFiles = UploadFiles.newend

  def create
    @uploadFiles = UploadFiles.new(params[:upload_files])end

Models:

Upload_Files:

class UploadFiles < ActiveRecord::Base
  attr_accessible :inventory, :material_list
  has_one :inventory
  has_one :material_list
  has_attached_file :inventory, :material_list

  def new
    {
      "name" => read_attribute(:upload_file_name),
      "size" => read_attribute(:upload_file_size),
      "url" => upload_file.url(:original),
      "delete_url" => upload_file_path(self),
      "delete_type" => "DELETE" 
      }
  endend

Inventory:

class Inventory < ActiveRecord::Base
  belongs_to :upload_filesend

Material List:

class MaterialList < ActiveRecord::Base
  belongs_to :upload_filesend

_form:

<%= form_for :upload_files do |f| %><h3>Upload
Inventory</h3><%= f.file_field :inventory %><h3>Upload Product
List</h3><%= f.file_field :material_list %><div
class="actions">
    <%= f.submit "Upload" %></div><% end %>

Could you please tell me what am I doing wrong and how to fix it? Thank you 
in advance.


Note: In case you haven''t noticed, I''m using paperclip and
rails 3.x.x

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