When your Google account couldn't sign in on your rooted phone?
Solution
Download Root Explorer App.
Open Root Explorer App. Mount (change to) it as read and write (R/W)
Go to system>etc>long press hosts and select 'open in text editor'.
Then erase everything there and type following.
127.0.0.1 localhost
#127.185.66.4 android.clients.google.com
Save it by touching 3 dots on top right corner and exit.
Done