not able to add another gmail account to ipad mini it says something imap.gmail while adding an gmail account

Not able to add another gmail account to ipad mini it says something imap.gmail while adding an gmail account. The device already has my brother gmail created apple id so I also created mine using itunes .I can log in itunes and download apps and I want to do the same using ipad mini with my apple id but when trying to add another account it says something imap.gmail incorrect. Is there a way to add 2 gmail apple id .