Topic: Youtube_model pluign issue ?

Hi ,
      i want uplaod videos using youtube model pluign and youtube api. i follow all instructions . But i am getting below error .

Error:
----------
can't convert nil into String

app/controllers/videos_controller.rb:42:in `create'

Request

Parameters:

{"commit"=>"Create",
"authenticity_token"=>"bb4gNcdtGNNo4fsCJt/vZxEYP+7B7L3NtTD2OmmWsJU=",
"utf8"=>"\342\234\223",
"vid"=>{"category"=>"Film",
"auth_sub"=>"1/-jwDoI3pYKaS4JUdoTXjNjWezgjDQ4mStDXZy1nk8ag",
"title"=>"sdgsdgds",
"token"=>"1/-jwDoI3pYKaS4JUdoTXjNjWezgjDQ4mStDXZy1nk8ag",
"description"=>"",
"file"=>#<ActionDispatch::Http::UploadedFile:0x6712638 @content_type="video/x-msvideo",
@headers="Content-Disposition: form-data; name=\"vid[file]\"; filename=\"butterfinger-surprise.avi\"\r\nContent-Type: video/x-msvideo\r\n",
@original_filename="butterfinger-surprise.avi",
@tempfile=#<File:C:/DOCUME~1/Anu/LOCALS~1/Temp/RackMultipart20110522-5484-1s9c9tt-0>>,
"keywords"=>""}}


Here my code:
-------------------
In controller:
-------------------

   
def authorise
client = GData::Client::DocList.new
if params[:token]
client.authsub_token = params[:token] # extract the single-use token from the URL query params
session[:token] = client.auth_handler.upgrade()
client.authsub_token = session[:token] if session[:token]
end
redirect_to videos_path
end


def new
@categories ||= Vid.video_categories
@video = Vid.new(:token => session[:token]) 
end

def create
@video = Vid.new(params[:vid])
if !@video.save
render :action => :new
end

end

In views:
------------
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Untitled Document</title>
<meta content="text/html; charset=iso-8859-1" http-equiv="Content-Type" />
</head>

<body bgcolor="#FFFFFF">

   
    <%= form_for(@video,  :url => {:action => "create" ,:controller =>"videos"},  :html => {:multipart => true}) do |f| %>
   
   
<% if @video.errors.any? %>
<h2><%= pluralize(@video.errors.count, "error") %> prohibited this user from being saved:</h2> 
  <ul>
    <% @video.errors.full_messages.each do |msg| %>
      <li><%= msg %></li>
    <% end %>
  </ul>
<% end %>



    <%= f.hidden_field :auth_sub, :value => session[:token] %>
    <%= f.text_field :token , :value => session[:token] %>
    <br/>
    <%= f.label :title %>
    <%= f.text_field :title %>

<br/>
<%= f.label :description %>
<%= f.text_area :description, :rows => 6 %>
<br/>

   

<%= f.label :category %>
<%= f.select :category, @categories %>

<br/>
   

<%= f.label :keywords %>
<%= f.text_field :keywords %>
<br/>
<%= f.label :file %>
<%= f.file_field :file %>
   
<br/>
<%= f.submit 'Create' %>

<% end %>

</body>
</html>

In model:
-------------
class Vid < YouTubeModel::Base #inherits from ActiveResource::Base
  self.default_youtube_options= {:itemPerPage => 10}

  schema do
    attribute :title, :string
    attribute :description, :string
    attribute :keywords, :string
    attribute :category, :string
    attribute :file, :string
    attribute :token, :string
  end

  validates_presence_of :title
  validates_presence_of :token #needed on remote crud operation
  validates_presence_of :file, :if => Proc.new{|vid| vid.new? }

end

Vid.top_rated(:startIndex => 10, :itemPerPage => 30)

Let me know any one about this error .

Thanks in advance.

Re: Youtube_model pluign issue ?

may i see the instruction ??