Fatal error: Uncaught Error: Call to undefined function get_the_block_template_html() in /usr/home/4synowiec/domains/website-test.ct8.pl/public_html/wp-includes/template-canvas.php:12
Stack trace:
#0 {main}
  thrown in /usr/home/4synowiec/domains/website-test.ct8.pl/public_html/wp-includes/template-canvas.php on line 12