Uncaught Error: Call to undefined function glitter_post_thumbnail()
in /home/glittersalon/glitter.co.jp/public_html/wp-content/themes/glitter/template-parts/content.php on line 32

Call stack:

1. require()
   wp-includes/template.php:812
2. load_template('/home/glittersalon/g...te-parts/content.php', false, array)
   wp-includes/template.php:745
3. locate_template(array, true, false, array)
   wp-includes/general-template.php:206
4. get_template_part('template-parts/content', 'voice')
   wp-content/themes/glitter/index.php:40
5. include('/home/glittersalon/g...es/glitter/index.php')
   wp-includes/template-loader.php:106
6. require_once('/home/glittersalon/g.../template-loader.php')
   wp-blog-header.php:19
7. require('/home/glittersalon/g...l/wp-blog-header.php')
   index.php:17