Unable to render Card preview


I have a wordpress site with normal twitter share links with a theme, but I had problems for to share links with images in Twitter while Facebook and other Social links was sharing normally. For recomendation of the template I installed YOAST SEO for to get card share. Yesterday I could share some articles with images and some don’t. But I changed some folders permissions (755 for folders and 644 for files, all normal), and now I can’t share no one image.
For to configurate YOAST I add in header.php, before tag the following code:

#twitter cards hack
if(is_single() || is_page()) {
$twitter_url    = get_permalink();
$twitter_title  = get_the_title();
$twitter_desc   = get_the_excerpt();
$twitter_thumbs = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), full );
$twitter_thumb  = $twitter_thumbs[0];
if(!$twitter_thumb) {
$twitter_thumb = 'http://www.gravatar.com/avatar/8eb9ee80d39f13cbbad56da88ef3a6ee?rating=PG&size=75';}
$twitter_name   = str_replace('@', '', get_the_author_meta('twitter'));
<meta name="twitter:card" value="summary" />
<meta name="twitter:url" value="<?php echo $twitter_url; ?>" />
<meta name="twitter:title" value="<?php echo $twitter_title; ?>" />
<meta name="twitter:description" value="<?php echo $twitter_desc; ?>" />
<meta name="twitter:image" value="<?php echo $twitter_thumb; ?>" />
<meta name="twitter:site" value="@libdemvoice" />
  if($twitter_name) { ?>
<meta name="twitter:creator" value="@<?php echo $twitter_name; ?>" />

But in Card validator the result is “Unable to render Card preview”

Then I have two doubts, one with the correct code and two with folder permissions. I think this could be affect something.
I’m not a good web developer, please explain me for dummies.



We’re not able to help without a URL to check. Did you check the troubleshooting post?


i have same issue
unable to render card preview
below is site url


As the troubleshooting post says, the error you’re seeing is almost always an SSL configuration issue. Your site supports multiple insecure and unsafe protocols (was well as newer ones) and you’ll need to look into this.