Export Gallery

Fatal error: Uncaught Error: Call to undefined function get_field() in /home/u748271495/domains/yueliangabion.com/public_html/wp-content/themes/yueliangabion/Export-gallery.php:34 Stack trace: #0 /home/u748271495/domains/yueliangabion.com/public_html/wp-includes/template-loader.php(106): include() #1 /home/u748271495/domains/yueliangabion.com/public_html/wp-blog-header.php(19): require_once('/home/u74827149...') #2 /home/u748271495/domains/yueliangabion.com/public_html/index.php(17): require('/home/u74827149...') #3 {main} thrown in /home/u748271495/domains/yueliangabion.com/public_html/wp-content/themes/yueliangabion/Export-gallery.php on line 34