Additional account won’t authenticate

I have 2 gmail accounts.  I attempted to add the second one to Outlook but it won't authenticate. Yes I have entered email and password correctly. After attempting to authenticate several times I attempt to delete the 2nd account and find that account listed 5 times in my list of accounts. Now when I open outlook all of these authentication boxes keep popping up.  I shut it down then restart Outlook. Go to the Tools menu, select Accounts and everything just freezes. I have to Force quit to close outlook. Does this sound like a familiar problem to anyone? I'm running Home and Business 11 on a mac book pro OS X El Capitan.