Ruby on Rails

I have problems with multiple file upload. I tried Paperclip with jQuery file uplad plugin and get the error mentioned in the title. Files get uploaded without problems, but I keep getting this embarrassing error.

Can somebody offer a solution to my problem or suggest alternative solution that can be implemented in 2 hours? My client is getting a bit uneasy now.

I have tried everything I could think of and in the end I have modified the model following this advice:
https://github.com/blueimp/jQuery-File-Upload/issues/365#issuecomment-13859210

My code can be found at:
https://github.com/bigos/chrisb-images/blob/master/app/models/upload.rb

relevant bit in my model looks like this:

  def to_jq_upload
    {
      :files => [
                 {
                   :name => upload_file_name,
                   :type => upload_content_type,
                   :size => upload_file_size,
                   :url => upload.url,
                   :delete_url => upload_path(self),
                   :delete_type => "DELETE" 
                 }
                ]
    }
  end

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