I get nil on json response properties except 'linkedin_url' which returns the linkedin link I provided

my code 
`profile = Linkedin::Profile.new("https://www.linkedin.com/in/chineduabalogu/")`
`render :json => profile.to_json`

<img width="523" alt="Screenshot 2019-05-07 at 4 54 44 PM" src="https://user-images.githubusercontent.com/8310934/57332501-dd5b9100-70e8-11e9-97fe-ab48fe51d63b.png">
