Unable to use predict.by_url

[PreciselyAlyss]

Logs from heroku
2019-02-25T15:25:24.618217+00:00 app[web.1]: 2019-02-25 15:25:24 - ArgumentError - wrong number of arguments (given 0, expected 1):
2019-02-25T15:25:24.618247+00:00 app[web.1]: /app/vendor/bundle/ruby/2.5.0/gems/clarification-0.3.0/lib/clarification/client.rb:14:in predict' 2019-02-25T15:25:24.618250+00:00 app[web.1]: /app/app.rb:38:in block in <top (required)>'

Using this code

Clarification.configure do |config|
   config.api_key = ENV['CLARIFAI_SECRET']
   config.default_public_models = [:general]
end
clar_client = Clarification::Client.new
clar_response = clar_client.predict.by_url("https://i.imgur.com/7lHfzvl.jpg")