This error has already been resolved with the latest theme release.

This is a conflicting issue with the Jetpack plugin that you have installed and with the theme’s youtube shortcode. However, the 1.8 version of the theme already have an updated code which should resolve this issue.

Anyways, in order to solve this, you can replace all the “youtube_shortcode” name on the theme and replace it with another name. Here’s a step by step guide:

1.) Open “shortcodes.php” located inside “inc/shortcodes/” folder.

2.) Search for this line of code:

function youtube_shortcode($atts, $content=null){

And replace it with this one:

function youtube_pulp_shortcode($atts, $content=null){

3.) Also search for this line of code:

add_shortcode('youtube', 'youtube_shortcode');

And replace it with this one:

add_shortcode('youtube', 'youtube_pulp_shortcode');