Fatal error: Uncaught Error: Call to undefined function wp_is_block_theme() in /customers/1/5/c/sbhorsemanship.be/httpd.www/academy/wp-content/plugins/learnpress/inc/block-template/class-abstract-block-template.php:33
Stack trace:
#0 /customers/1/5/c/sbhorsemanship.be/httpd.www/academy/wp-content/plugins/learnpress/inc/block-template/class-block-template-archive-course.php(18): Abstract_Block_Template->__construct()
#1 /customers/1/5/c/sbhorsemanship.be/httpd.www/academy/wp-content/plugins/learnpress/config/block-templates.php(10): Block_Template_Archive_Course->__construct()
#2 /customers/1/5/c/sbhorsemanship.be/httpd.www/academy/wp-content/plugins/learnpress/inc/Helpers/Config.php(71): include('/customers/1/5/...')
#3 /customers/1/5/c/sbhorsemanship.be/httpd.www/academy/wp-content/plugins/learnpress/inc/block-template/class-block-template-handle.php(38): LearnPress\Helpers\Config->get('block-templates')
#4 /customers/1/5/c/sbhorsemanship.be/httpd.www/academy/wp-includes/class-wp-hook.php(303): Block_Template_Handle->register_tag_block('')
#5 /customers/1/5/c/sbhorsemanship.be/httpd.www/academy/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(NULL, Array)
#6 /customers/1/5/c/sbhorsemanship.be/httpd.www/academy/wp-includes/plugin.php(470): WP_Hook->do_action(Array)
#7 /customers/1/5/c/sbhorsemanship.be/httpd.www/academy/wp-settings.php(578): do_action('init')
#8 /customers/1/5/c/sbhorsemanship.be/httpd.www/academy/wp-config.php(118): require_once('/customers/1/5/...')
#9 /customers/1/5/c/sbhorsemanship.be/httpd.www/academy/wp-load.php(50): require_once('/customers/1/5/...')
#10 /customers/1/5/c/sbhorsemanship.be/httpd.www/academy/wp-blog-header.php(13): require_once('/customers/1/5/...')
#11 /customers/1/5/c/sbhorsemanship.be/httpd.www/academy/index.php(17): require('/customers/1/5/...')
#12 {main}
  thrown in /customers/1/5/c/sbhorsemanship.be/httpd.www/academy/wp-content/plugins/learnpress/inc/block-template/class-abstract-block-template.php on line 33