Gmail Poller

Can anyone help me how can i integrate gmail with appian so i can see all the unread emails in appian? 

There is this gmail connected system plugin in appian market. but its not working.. is there any other way i can do that ?                                                                 

Below is the error i get when i m using the gmail connected system

and this is the Gmail connected system I use.

  Discussion posts and replies are publicly visible