Actually it was my mistake, I have used wrong API key in test mode, So it will showing the console error. May be in future , UNA developer will showing this  error message on application front-end eg"error-pop" , Its more user friendly . It will time saving .

Leonids, I need one more thing , Can you please let me know , How i will change the my website layout and design as i need it. actually i need to re-design all things in there.  I wanna use my own css. 

Please let me know i will improve it !

Waiting for your response.