Failed to authenticate on SMTP server with username "*email" using 2 possible authenticators

Hi ,

Im using Yii 1.1.

Extension Yii mail to send mail. I used this extension for one year plus.

Suddenly today i couldn’t send the email out.

its throws this error

"Failed to authenticate on SMTP server with username "bla2@gmail.com" using 2 possible authenticators "

i searched through google look for solution but still no luck couldn’t solve this error.

Pls need to solve this.