Fatal error: Uncaught TypeError: returnHistoryBlocksInLessonList(): Argument #1 ($tid) must be of type int, string given, called in /var/www/www-root/data/www/smartme.me/wp-content/themes/smartme/page-classroom.php on line 17 and defined in /var/www/www-root/data/www/smartme.me/wp-content/themes/smartme/custom-post-type/skyeng-lesson-type.php:979 Stack trace: #0 /var/www/www-root/data/www/smartme.me/wp-content/themes/smartme/page-classroom.php(17): returnHistoryBlocksInLessonList('', '', '') #1 /var/www/www-root/data/www/smartme.me/wp-includes/template-loader.php(106): include('/var/www/www-ro...') #2 /var/www/www-root/data/www/smartme.me/wp-blog-header.php(19): require_once('/var/www/www-ro...') #3 /var/www/www-root/data/www/smartme.me/index.php(17): require('/var/www/www-ro...') #4 {main} thrown in /var/www/www-root/data/www/smartme.me/wp-content/themes/smartme/custom-post-type/skyeng-lesson-type.php on line 979