Bugs of OOP

Fatal error: Uncaught PDOException: SQLSTATE[HY093]: Invalid parameter number: number of bound variables does not match number of tokens in C:\xampp\htdocs\OOP\classes\db.class.php:48 Stack trace: #0 C:\xampp\htdocs\OOP\classes\db.class.php(48): PDOStatement->execute(Array) #1 C:\xampp\htdocs\OOP\classes\db.class.php(74): DB->run() #2 C:\xampp\htdocs\OOP\classes\user.class.php(124): DB->all() #3 C:\xampp\htdocs\OOP\index.php(18): User->get_all() #4 {main} thrown in C:\xampp\htdocs\OOP\classes\db.class.php on line 48