update_with_media error

[Hacker John]

when i post the image i getting this error message 

here my code 

Twitter::Error::Forbidden in HomeController#share_message

Missing or invalid url parameter

  @img ="#{@si...@tweet.avatar.url(:large)}"

  get_user.update_with_media(@tweet.desc, open(@img.to_s) {|f| f.read })