Fatal error: Uncaught Error: Call to undefined function add_shortcode() in C:\xampp\htdocs\WAIT FOR DELETE\wp-content\plugins\jetpack\modules\shortcodes\tweet.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\WAIT FOR DELETE\wp-content\plugins\jetpack\modules\shortcodes\tweet.php on line 21