gmailer not connecting go gmail account.

hi all i have installed gmailer gem and when trying to connect with my
gmail account using it im getting the error "RuntimeError (Not
connected, verify the credentials.)".

Code i used are as follows:

    require 'rubygems'
    require 'gmailer'

    GMailer.connect("mailid@gmail.com","password") do |g|

        g.send(

      :to => "karthiu@symbiountech.com",

      :subject => "Mail from application",

      :body => "mail from application"

  )

    end