\Exception

Error: Call to undefined function twentynineteen_can_show_post_thumbnail() in /var/www/html/wp-content/themes/thiomucase-theme/header.php:26 Stack trace: #0 /var/www/html/wp-includes/template.php(810): require_once() #1 /var/www/html/wp-includes/template.php(745): load_template() #2 /var/www/html/wp-includes/general-template.php(48): locate_template() #3 /var/www/html/wp-content/themes/thiomucase-theme/single.php(12): get_header() #4 /var/www/html/wp-includes/template-loader.php(106): include('...') #5 /var/www/html/wp-blog-header.php(19): require_once('...') #6 /var/www/html/index.php(17): require('...') #7 {main}

1. in Can\Frontend\Error\ErrorHandler::handleException()

   at :