Site can not communicate properly with Jetpack

Hi,

Noticed that Jetpack didn’t post automatically my posts to twitter and google+.

So I went to Jetpack settings and saw this message in Debug:

It looks like your site can not communicate properly with Jetpack.

SELF:
	Array
(
    [headers] => Array
        (
            [server] => nginx
            [date] => Sat, 02 Apr 2016 17:46:51 GMT
            [content-type] => text/plain;charset=utf-8
            [connection] => close
            [expires] => Wed, 11 Jan 1984 05:00:00 GMT
            [cache-control] => no-cache, must-revalidate, max-age=60
            [pragma] => no-cache
            [x-hacker] => Jetpack Test
            [x-ac] => 3.sjc _bur
            [strict-transport-security] => max-age=15552000
        )

    [body] => {"error":"Unknown Error","error_description":"An unknown error has occurred."}
    [response] => Array
        (
            [code] => 400
            [message] => Bad Request
        )

    [cookies] => Array
        (
        )

    [filename] =>
)

Please assist.
My site is abrikos.co

https://wordpress.org/plugins/jetpack/