laravel 5.4 pusher call back not working

I ve this problem with pusher . it is working fine on public channel but on on private channel does seem to be working.

Pusher : No callbacks on private-notification.1 for pusher:subscription_error

above is the error am getting

Pusher.logToConsole = true;
var pusher = new Pusher('xxxxxxxxxxxxxxxxxxxxx', {
    authEndpoint: '',
    encrypted: true,
    cluster : "mt1",
    auth: {
        headers: {
            'X-CSRF-Token': ""
        }
    }
});

var channel = pusher.subscribe("private-notification.");


channel.bind('my-event', addMessage);


function addMessage(data)
{
    $.growl.notification({
        message: '<strong> ' + data.title + '</strong><br>' + data.message
    })
}

i don't know where the problem is. Any help will be highly appreciated.

Broadcast::channel('notification.*', function ($user) {
    return false;
});

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