Session issue

[BorisKourt]

Sorry a tad new to this, I installed Flickering via composer and everything was going well until I tried:

Flickering::handshake($apiKey, $apiSecret);
$photos = Flickering::getResultsOf('people.getPhotos', array('user_id' => '31667913@N06'));
var_dump($photos);

I then got:

PHP Fatal error:  Uncaught exception 'RuntimeException' with message 'Failed to start the session because headers have already been sent by "/Applications/wordpress-4.0-1/apps/wordpress/htdocs/wp-admin/menu-header.php" at line 132.'  ...

I am using flickering from within a WordPress plugin structure, just wondering if there is a way around having to start this symfony session? (or if there is something else wrong?)

as a note that the following:

Flickering::handshake($apiKey, $apiSecret);

does not produce any errors.

Thanks

---

complete test file:

<?php namespace agg\flickr;

use Flickering\Facades\Flickering;

$apiKey = <redact>;
$apiSecret = <redact>;

function fetch()
{
    Flickering::handshake($apiKey, $apiSecret);
    $photos = Flickering::getResultsOf('people.getPhotos', array('user_id' => '31667913@N06'));
    var_dump($photos);
}