Fatal error: Uncaught Error: Call to undefined function mathspartner_post_thumbnail() in /home/httpd/vhosts/mathspartner.ch/httpdocs/wp-content/themes/mathspartner/template-parts/content.php:32
Stack trace:
#0 /home/httpd/vhosts/mathspartner.ch/httpdocs/wp-includes/template.php(787): require()
#1 /home/httpd/vhosts/mathspartner.ch/httpdocs/wp-includes/template.php(720): load_template('/home/httpd/vho...', false, Array)
#2 /home/httpd/vhosts/mathspartner.ch/httpdocs/wp-includes/general-template.php(206): locate_template(Array, true, false, Array)
#3 /home/httpd/vhosts/mathspartner.ch/httpdocs/wp-content/themes/mathspartner/single.php(20): get_template_part('template-parts/...', 'cour_cresus')
#4 /home/httpd/vhosts/mathspartner.ch/httpdocs/wp-includes/template-loader.php(106): include('/home/httpd/vho...')
#5 /home/httpd/vhosts/mathspartner.ch/httpdocs/wp-blog-header.php(19): require_once('/home/httpd/vho...')
#6 /home/httpd/vhosts/mathspartner.ch/httpdocs/index.php(17): require('/home/httpd/vho...')
#7 {main}
thrown in /home/httpd/vhosts/mathspartner.ch/httpdocs/wp-content/themes/mathspartner/template-parts/content.php on line 32