Processing: x0000 NO [ALERT] Please log in via your web browser:
Gmail is trying to indicate following for this error "web login required error" :
* Gmail does not recognize your password
* May be you are trying to login from a new location or new device.
* 2-Step Verification might have been enabled.
* You may be trying to sign in from another country and Google thinks your login as suspicious.
Please visit following links to sort out this issue:
2-Step verification with Gmail