autofailover "test email" button reloads the page and throws an error

i am trying out gmail smtp server and couchbase internal smtp server but neither seem to work

Server error during processing: ["web request failed",

{path,"/settings/alerts/testEmail"}

,

{type,error}

,

{what,undef}

,
{trace,
[{mimemail,encode,
[{<<"text">>,<<"plain">>,
[

{<<"From">>,<<"<membase@localhost>">>}

,

{<<"To">>, <<"<farshid@couchbase.com>">>}

,

{<<"Subject">>, <<"Test email from Membase">>}

],
[],
<<"This email was sent to you to test the email alert email server settings.">>}]},

{ns_mail,send,5}

,

{menelaus_web, handle_settings_alerts_send_test_email,1}

,

{menelaus_web,loop,3}

,

{mochiweb_http,headers,5}

,

{proc_lib,init_p_do_apply,3}

]}]