API Error Description: Session key invalid or no longer valid (error 102) - facebook

Question

I cant figure out why facebook publish is not working on this site
I get
API Error Code: 102
API Error Description: Session key invalid or no longer valid
Error Message: Iframe dialogs must be called with a session key
While calling the stream.publish method as iframe
<script type="text/javascript">
(function() {
var e = document.createElement('script'); e.async = true;
e.src = document.location.protocol
+ '//connect.facebook.net/fr_FR/all.js';
document.getElementById('fb-root').appendChild(e);
}());
window.fbAsyncInit = function()
{
FB.init({ appId: '303380259758621',
status: true,
channelUrl: 'http://www.crabegame.com/channel.php',
cookie: true,
xfbml: true,
oauth: true});
}
function PublishStream(score)
{
FB.ui(
{
method: 'stream.publish',
display : 'iframe',
message : '',
attachment:
{
name: 'CrabeGame',
caption: 'Essaye de battre mon score sur le Crabe Game !',
description: "J'ai réalisé un score de " + score + "points au Crabe Game !",
href: 'http://www.crabegame.com',
media:
[
{
type: 'image',
src: 'http://crabegame.com/media/crabe_fb.png',
href: 'http://www.crabegame.com'
}
]
},
action_links:
[
{
text: 'Play Crabe Game',
href: 'http://www.crabe-game.com'
}
],
user_message_prompt: 'Publier sur votre mur'
},
function (response)
{
if (response && response.post_id)
{
}
}
);
}
</script>

Answer 1

This means that you have no current user. Try this in order to call PublishStream:
FB.login(function(response) {
if (response.authResponse) {
PublishStream();
} else {
console.log('Not logged in');
}
});

Answer 2

you don´t need a logged in user, just remove display: "iframe", worked for me. it will still show in an iframe, but without error. don´t ask me why, with 1:1 the same app settings it works WITH the display value in another app of mine...at least that worked for me with the apprequest dialog, might be the same here.
and i would use "feed" instead of "stream.publish".
see here: https://developers.facebook.com/docs/reference/dialogs/feed/
also: Using Like Button and FB.ui (apprequests) On the Same Page Conflicts