Fatal error: Uncaught Error: Call to undefined method MemberWunder\Models\Course::get_course() in /www/htdocs/w019b4b9/annettegruebnau.com/wp-content/plugins/tw-membership/include/models/celement.php:30 Stack trace: #0 /www/htdocs/w019b4b9/annettegruebnau.com/wp-content/plugins/tw-membership/include/models/course.php(517): MemberWunder\Models\CElement->is_preview() #1 /www/htdocs/w019b4b9/annettegruebnau.com/wp-content/plugins/tw-membership/include/controller/pages.php(687): MemberWunder\Models\Course->get_link() #2 /www/htdocs/w019b4b9/annettegruebnau.com/wp-includes/class-wp-hook.php(307): MemberWunder\Controller\Pages::load_logic(Object(WP)) #3 /www/htdocs/w019b4b9/annettegruebnau.com/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(Object(MemberWunder\Hooks\Elementor), Array) #4 /www/htdocs/w019b4b9/annettegruebnau.com/wp-includes/plugin.php(522): WP_Hook->do_action(Array) #5 /www/htdocs/w019b4b9/annettegruebnau.com/wp-includes/class-wp.php(771): do_action_ref_array('wp', Array) #6 /www/htdocs/w019b4b9/annet in /www/htdocs/w019b4b9/annettegruebnau.com/wp-content/plugins/tw-membership/include/models/celement.php on line 30