Swift_TransportException in AbstractSmtpTransport.php line 383: Expected response code 250 but got code "535",

This is the error that throws me:

Swift_TransportException in AbstractSmtpTransport.php line 383: Expected response code 250 but got code "535", with message "535-5.7.8 Username and Password not accepted. Learn more at 535 5.7.8 http://ift.tt/1b3rDlG px4sm26723732oec.7 - gsmtp "

I have enabled "Allow less secure app" in my account and i haven't enable 2-Step Verification. And yes i already did "Display Unlock Captcha" configuration too, and nothing's changed. Please somebody help me.

via Chebli Mohamed