Fatal error: Uncaught TypeError: BookModel::getRelated(): Argument #2 ($categoryId) must be of type int, null given, called in /home/u292419150/domains/boibari.in/public_html/app/Controllers/BookController.php on line 39 and defined in /home/u292419150/domains/boibari.in/public_html/app/Models/Book.php:58 Stack trace: #0 /home/u292419150/domains/boibari.in/public_html/app/Controllers/BookController.php(39): BookModel->getRelated() #1 /home/u292419150/domains/boibari.in/public_html/app/Helpers/functions.php(62): BookController->show() #2 /home/u292419150/domains/boibari.in/public_html/index.php(230): Router::dispatch() #3 {main} thrown in /home/u292419150/domains/boibari.in/public_html/app/Models/Book.php on line 58