Warning: array_key_exists() expects parameter 2 to be array, null given in /home/.sites/8/site7281296/web/wp-content/plugins/jetpack/modules/shortcodes/slideshow.php on line 31

Fatal error: Uncaught Error: Call to undefined function add_shortcode() in /home/.sites/8/site7281296/web/wp-content/plugins/jetpack/modules/shortcodes/slideshow.php:32
Stack trace:
#0 /home/.sites/8/site7281296/web/wp-content/plugins/jetpack/modules/shortcodes/slideshow.php(313): Jetpack_Slideshow_Shortcode->__construct()
#1 /home/.sites/8/site7281296/web/wp-content/plugins/jetpack/modules/shortcodes/slideshow.php(317): Jetpack_Slideshow_Shortcode::init()
#2 {main}
  thrown in /home/.sites/8/site7281296/web/wp-content/plugins/jetpack/modules/shortcodes/slideshow.php on line 32