Error with fetchAll using order by

I'm doing a task scheduling system.

I need to show these tasks to the user, I created a file called tarefas.php to query the MySQL database:

<?php
    include_once 'conexao-calendario.php';
    include_once 'VerificarLogin.php';
    $usuario = $_SESSION['email'];

    $sql = "SELECT id, titulo, local, data, horario, status FROM eventos WHERE email = '$usuario' ORDER BY data, hora ";
    $select = $pdo->prepare($sql);
    $result = $pdo->query($sql);
    $dados = $result->fetchAll( PDO::FETCH_ASSOC );
    var_dump($dados);
?>

Without the order by the correct array appears, but with it it gives the following error:

  

Fatal error: Uncaught Error: Call to a member function fetchAll () on boolean in C: \ xampp \ htdocs \ hope \ tasks.php: 9 Stack trace: # 0 {main} thrown in C: \ xampp \ htdocs \ hope \ tasks.php on line 9