Fatal error: Uncaught Error: Call to undefined function get_field()
in /home/circle/helvetia.jp/public_html/wp-content/themes/helvetia/single-ballet.php on line 12

コールスタック:

1. include()
   wp-includes/template-loader.php:106
2. require_once()
   wp-blog-header.php:19
3. require()
   index.php:17