Error 100 schedule a post on Facebook Page - facebook

Question

I've used the following code. It works fine without 'scheduled_publish_time', otherwise I get this error "(#100) You cannot specify a scheduled publish time on a published post".
I've previously registered my app with another piece of code. It's so weird.
include_once("inc/facebook.php"); //include facebook SDK
$appId = '21xxxxxxxxxxx'; //Facebook App ID
$appSecret = '6b8f4bxxxxxxxxxxxxxd56'; // Facebook App Secret
$return_url = 'http://localhost:8888/...'; //return url (url to script)
$homeurl = 'http://localhost:8888/...'; //return to home
$fbPermissions = 'publish_stream,manage_pages'; //Required facebook permissions
//Call Facebook API
$facebook = new Facebook(array(
'appId' => $appId,
'secret' => $appSecret,
'cookie' => true,
'fileUpload' => true
));
$accounts = $facebook->api('/me/accounts');
$PAGE_ID = get_option('fb_post_cron_page'); // it is an option saved in WordPress
foreach($accounts['data'] as $account){
if($account['id'] == $PAGE_ID){
$ACCESS_TOKEN = $account['access_token'];
}
}
$post_url = '/'.$PAGE_ID.'/photos';
$upload_dir = wp_upload_dir();
$upload_dir= $upload_dir['path'];
$timezone= 'Europe/Rome';
$date = new DateTime($dateStr, new DateTimeZone($timezone));
//posts message on page statues
$args = array(
'access_token' => $ACCESS_TOKEN,
'source' => '#' . $image_abs_path,
'message' => $post_message,
'published' => true,
'scheduled_publish_time' => $date->getTimestamp()
);
try {
$postResult = $facebook->api($post_url, 'post', $args );
} catch (FacebookApiException $e) {
echo $e->getMessage();
}

Answer 1

you have to set 'published' to false
$args = array(
'access_token' => $ACCESS_TOKEN,
'source' => '#' . $image_abs_path,
'message' => $post_message,
'published' => false,
'scheduled_publish_time' => $date->getTimestamp()
);