Facebook.streamPublish does not write on wall...why?

Question

$titleData = json_encode(array(   
        'gname'  => $giftName,   
        'url'  => $appCanvasUrl,   
    )); 

$bodyTemplate = '<a href="{url}">One gift</a> to {actor}!';   
        $bodyData = json_encode(array(   
            'url'  => $appCanvasUrl,   
        ));   
        $bodyGeneral = '<BR>Send the exclusive gifts to all your friends!';   
        $imgSrc = $appcallbackurl.'gifts/'.$giftImage;   
        $imgLink = $appCanvasUrl;   
        $target_ids = $friends[0];

Facebook.streamPublish($titleTemplate, $titleData, $bodyTemplate, $bodyData, $bodyGeneral, $imgSrc, $imgLink, '', $target_ids);

What am i doing wrong?I get the 500 error when i try to write on wall, i have permision, to post on wall, as i ask for it!Is there another way to use Facebook.streamPublish? tx a lot! I have a fbml app!