Fatal error: Uncaught Error: Call to undefined method STM_LMS_Sequential_Drip_Content::lesson_is_locked() in /home/customer/www/integrate-euproject.eu/public_html/wp-content/plugins/masterstudy-lms-learning-management-system/includes/Repositories/CoursePlayerRepository.php:88 Stack trace: #0 /home/customer/www/integrate-euproject.eu/public_html/wp-content/plugins/masterstudy-lms-learning-management-system/_core/stm-lms-templates/course-player.php(27): MasterStudy\Lms\Repositories\CoursePlayerRepository->get_main_data('module-4-it', 8461) #1 /home/customer/www/integrate-euproject.eu/public_html/wp-includes/template-loader.php(106): include('/home/customer/...') #2 /home/customer/www/integrate-euproject.eu/public_html/wp-blog-header.php(19): require_once('/home/customer/...') #3 /home/customer/www/integrate-euproject.eu/public_html/index.php(17): require('/home/customer/...') #4 {main} thrown in /home/customer/www/integrate-euproject.eu/public_html/wp-content/plugins/masterstudy-lms-learning-management-system/includes/Repositories/CoursePlayerRepository.php on line 88