In order to access your gmail account, you have to activate your POP/SMTP settings.
Did you do it recently?
If not yet, I am ready to assist you.
What is the exact error you are getting?
(By the way, you have to use 995th port, not 110, for pop3)
What email client program are you currently using, to access your gmail account?
(For example, thunderbird, outlook etc)
I understand now,
So, you are not using a client program.
Are you accessing your emails from webmail GMAIL interface? (www.gmail.com)