Can not add a pop3 account of gmail

Can not add a pop3 account of gmail

I have already email account in Gmail. I am trying now to add this pop3 account into Zoho Email, but it doesn't work. I have make Gmail setting available for pop3 access, then step by step to add a new pop3 email. But it shows always the message " [AUTH] Web login required: https://support.google.com/mail/answer/78754  ".

Anyone knows why?
Thank in advance
Dao