TypeError (can't convert nil into Integer):

[ilankasan]

I followed a simple example to upload a file. When i add to the upload form the field <%= f.file_field :uploaded_data %>, and submit the form (with or without an image), i get an error message in the web page:
500 Internal Server Error

On the server log i get an error message:TypeError (can't convert nil into Integer):

I am on rails 3.0.5 and Ruby 1.9.2 on Windows 7

I used the sample code at:http://clarkware.com/blog/2007/02/24/file-upload-fu

[bjorntrondsen]

I had the same issue on Linux, however only when using Phusion Passenger, not Thin or Webrick.
Jmoses seems to have a fix for this on his branch:

gem "attachment_fu", :git => "https://github.com/jmoses/attachment_fu.git", :branch => 'rails3'