Need help in Creating Redmine Uploader Plugin

I'm trying to create a redmine plugin that uploads files.

I used this tutorials:

I already succeeded in uploading files using ruby on rails... I want to integrate in a redmine plugin.

Here are my codes:

init.rb Code: require 'redmine'

Redmine::Plugin.register :redmine_pload do   name 'Redmine Pload plugin'   author 'Author name'   description 'This is a plugin for Redmine'   version '0.0.1'   url 'http://example.com/path/to/plugin’   author_url 'http://example.com/about’   menu :application_menu, :pload, { :controller => 'pload', :action => 'index' }, :caption => 'pload!' end

pload_controller.rb Code: require 'redmine'

Redmine::Plugin.register :redmine_pload do   name 'Redmine Pload plugin'   author 'Author name'   description 'This is a plugin for Redmine'   version '0.0.1'   url 'http://example.com/path/to/plugin’   author_url 'http://example.com/about’   menu :application_menu, :pload, { :controller => 'pload', :action => 'index' }, :caption => 'pload!' end

dota_file.rb Code: class DotaFile < ActiveRecord::Base   unloadable

  def self.save(upload)     name = upload['dotafile'].original_filename     directory = "C:\Program Files\BitNami Redmine Stack\apps\redmine\vendor\plugins\redmine_pload\public\data"     # create the file path     path = File.join(directory, name)     # write the file     File.open(path, "wb") { |f| f.write(upload['dotafile'].read) }   end

  def self.filename(upload)     wholename = String.new     wholename = upload['dotafile'].original_filename     return wholename   end

end

index.html.rb Code: <h2>Pload#index</h2>

<h1>File Upload</h1> <%= form_tag('uploadFile', :multipart => true) %> <p><label for="upload_file">Select File</label> : <%= file_field 'pload', 'datafile' %></p> <%= submit_tag %> <%= form_tag %>

my problem is... when i click the tab(link to plugin page) on redmine, it jst shows this error.

Internal error

An error occurred on the page you were trying to access. If you continue to experience problems please contact your redMine administrator for assistance.

I am trying things to fix this for 3 days now, yet I have not found the solution. Pls help me.