Twitter gem update_with_media method is returning "could not authenticate you"

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I'm using the Twitter gem to automate tweets. Since I want my tweets to also include an image I'm using the "update_with_media" method, like so:

def tweet
    client = Twitter::REST::Client.new do |config|
      config.consumer_key        = "my consumer key"
      config.consumer_secret     = "my consumer secret"
      config.access_token        = "my access token"
      config.access_token_secret = "my secret access token"
    end

    client.update_with_media("Some text \n ", open(self.image_url))
  end

The error that the being returned by twitter states "cannot authenticate you". My credentials I'm using above are most definitely correct though, as it posts a tweet without error when I use the update method (tweet w/out an image). Does anyone have any experience dealing with this or a similar issue? Thanks.

asked 2 mins ago

xxyyxx

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