Error while trying to add google(mail) account through accounts settings from my iphone

I am using my iphone 7 plus mobile.

I tried to add google account that i need to sync all my contacts and other things from my gmail account. When i tried to add a google mail account through accounts settings , it shows error sign in. Even i connect with my cellular data and also tried with other wifi connections, the same problem exists. Here i have attached the screenshot.