Fatal error: Uncaught Error: Call to a member function sections() on bool in /data/web/virtuals/289890/virtual/www/domains/oficcoacademy.cz/wp-content/plugins/memberpress-courses/app/helpers/Courses.php:365 Stack trace: #0 /data/web/virtuals/289890/virtual/www/domains/oficcoacademy.cz/wp-content/plugins/memberpress-courses/app/views/classroom/courses_sidebar.php(33): memberpress\courses\helpers\Courses::display_course_overview(false, true) #1 /data/web/virtuals/289890/virtual/www/domains/oficcoacademy.cz/wp-content/plugins/memberpress-courses/app/helpers/Courses.php(298): require('/data/web/virtu...') #2 /data/web/virtuals/289890/virtual/www/domains/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 /data/web/virtuals/289890/virtual/www/domains/oficcoacademy.cz/wp-includes/template-loader.php(106): include('/data/web/virtu...') #4 /data/web/virtuals/289890/virtual/www/domains/oficcoacademy in /data/web/virtuals/289890/virtual/www/domains/oficcoacademy.cz/wp-content/plugins/memberpress-courses/app/helpers/Courses.php on line 365