Fatal error: Uncaught Error: Call to undefined function twentynineteen_can_show_post_thumbnail() in /home/denisere/public_html/wp-content/themes/denisereis/template-parts/content/content-single.php:15 Stack trace: #0 /home/denisere/public_html/wp-includes/template.php(725): require() #1 /home/denisere/public_html/wp-includes/template.php(672): load_template('/home/denisere/...', false) #2 /home/denisere/public_html/wp-includes/general-template.php(168): locate_template(Array, true, false) #3 /home/denisere/public_html/wp-content/themes/denisereis/single.php(24): get_template_part('template-parts/...', 'single') #4 /home/denisere/public_html/wp-includes/template-loader.php(106): include('/home/denisere/...') #5 /home/denisere/public_html/wp-blog-header.php(19): require_once('/home/denisere/...') #6 /home/denisere/public_html/index.php(17): require('/home/denisere/...') #7 {main} thrown in /home/denisere/public_html/wp-content/themes/denisereis/template-parts/content/content-single.php on line 15