Fatal error: Uncaught Error: Call to a member function sections() on bool in /var/www/html/oficcoacademy.cz/wp-content/plugins/memberpress-courses/app/helpers/Courses.php:361 Stack trace: #0 /var/www/html/oficcoacademy.cz/wp-content/plugins/memberpress-courses/app/views/classroom/courses_sidebar.php(33): memberpress\courses\helpers\Courses::display_course_overview(false, true) #1 /var/www/html/oficcoacademy.cz/wp-content/plugins/memberpress-courses/app/helpers/Courses.php(294): require('/var/www/html/o...') #2 /var/www/html/oficcoacademy.cz/wp-content/plugins/memberpress-courses/app/views/classroom/courses_single_lesson.php(21): memberpress\courses\helpers\Courses::get_classroom_sidebar(Object(WP_Post)) #3 /var/www/html/oficcoacademy.cz/wp-includes/template-loader.php(106): include('/var/www/html/o...') #4 /var/www/html/oficcoacademy.cz/wp-blog-header.php(19): require_once('/var/www/html/o...') #5 /var/www/html/oficcoacademy.cz/index.php(17): require('/var/www/html/o...') #6 {main} thrown in /var/www/html/oficcoacademy.cz/wp-content/plugins/memberpress-courses/app/helpers/Courses.php on line 361