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Fatal error: Uncaught TypeError: CoursesDAO::check_if_you_are_registered(): Argument #2 ($id_users) must be of type int, null given, called in /home/lu1gip1f13ux/public_html/aprendeya/views/mod_courses.php on line 91 and defined in /home/lu1gip1f13ux/public_html/aprendeya/lib/coursesDAO.php:380 Stack trace: #0 /home/lu1gip1f13ux/public_html/aprendeya/views/mod_courses.php(91): CoursesDAO->check_if_you_are_registered() #1 /home/lu1gip1f13ux/public_html/aprendeya/views/courses.php(2): require_once('/home/lu1gip1f1...') #2 /home/lu1gip1f13ux/public_html/aprendeya/application/template.class.php(66): include('/home/lu1gip1f1...') #3 /home/lu1gip1f13ux/public_html/aprendeya/controller/coursesController.php(10): template->show() #4 /home/lu1gip1f13ux/public_html/aprendeya/application/router.class.php(86): coursesController->index() #5 /home/lu1gip1f13ux/public_html/aprendeya/index.php(22): router->loader() #6 {main} thrown in /home/lu1gip1f13ux/public_html/aprendeya/lib/coursesDAO.php on line 380