My Instagram Feed Demo

Fatal error: Uncaught Error: Call to undefined function array_key_first() in /home2/zavnewsn/public_html/wp-content/plugins/easy-facebook-likebox/my-instagram-feed/frontend/frontend.php:496 Stack trace: #0 /home2/zavnewsn/public_html/wp-includes/shortcodes.php(343): MIF_Front->mif_shortcode_func(Array, '', 'my-instagram-fe...') #1 [internal function]: do_shortcode_tag(Array) #2 /home2/zavnewsn/public_html/wp-includes/shortcodes.php(218): preg_replace_callback('/\\[(\\[?)(my\\-in...', 'do_shortcode_ta...', '<div class="fcb...') #3 /home2/zavnewsn/public_html/wp-includes/class-wp-hook.php(287): do_shortcode('<div class="fcb...') #4 /home2/zavnewsn/public_html/wp-includes/plugin.php(206): WP_Hook->apply_filters('<div class="fcb...', Array) #5 /home2/zavnewsn/public_html/wp-includes/post-template.php(253): apply_filters('the_content', '[my-instagram-f...') #6 /home2/zavnewsn/public_html/wp-content/themes/easymag/template-parts/content-page.php(15): the_content() #7 /home2/zavnewsn/public_html/wp-includes/template.php(725): re in /home2/zavnewsn/public_html/wp-content/plugins/easy-facebook-likebox/my-instagram-feed/frontend/frontend.php on line 496