ช่วยดูให้หน่อยค่ะ พอดีกำลังศึกษาภาษา php7 + pdo ค่ะ หาข้อผิดพลาดไม่เจอช่วยด้วยค่ะ

<?php
 //ถ้ามีค่าส่งมาจากฟอร์ม
    if(isset($_POST['Typebk']) && isset($_POST['Numberbk']) && isset($_POST['Yearbk']) && isset($_POST['datebk']) && isset($_POST['Sudbk'])  
    && isset($_POST['NameFrom']) && isset($_POST['NameTo']) && isset($_POST['posFrom'])  && isset($_POST['idmemFrom']) 
    && isset($_POST['phonefrom']) && isset($_POST['nameby'])){
    //ไฟล์เชื่อมต่อฐานข้อมูล
    require_once 'connects/connect.php';
    //ประกาศตัวแปรรับค่าจากฟอร์ม
    $Typebk = $_POST['Typebk'];
    $Numberbk = $_POST['Numberbk'];
    $Yearbk = $_POST['Yearbk'];
    $datebk = $_POST['datebk'];
    $Sudbk = $_POST['Sudbk'];
    $NameFrom = $_POST['NameFrom'];
    $NameTo= $_POST['NameTo'];
    $posFrom = $_POST['posFrom'];
    $idmemFrom = $_POST['idmemFrom'];
    //$posTo = $_POST['posTo'];
    //$idmemTo = $_POST['idmemTo'];
    $phonefrom = $_POST['phonefrom'];
    //$phoneto = $_POST['phoneto'];
    $nameby = $_POST['nameby'];


    //sql insert 
    $stmt = $conn->prepare("INSERT INTO bookout_2565 (Typebk, Numberbk, Yearbk, datebk, Sudbk, NameFrom, NameTo, posFrom, idmemFrom, phonefrom, nameby)
    VALUES (:Typebk, :Numberbk, :Yearbk, :datebk, :Sudbk, :NameFrom, :NameTo, :posFrom, :idmemFrom, :phonefrom, :nameby)");
    $stmt->bindParam(':Typebk',        $Typebk,     PDO::PARAM_STR);
    $stmt->bindParam(':Numberbk',      $Numberbk,       PDO::PARAM_STR);
    $stmt->bindParam(':Yearbk',        $Yearbk,        PDO::PARAM_STR);
    $stmt->bindParam(':datebk',        $datebk ,    PDO::PARAM_STR);
    $stmt->bindParam(':Sudbk',         $Sudbk,          PDO::PARAM_STR);
    $stmt->bindParam(':NameFrom',      $NameFrom ,          PDO::PARAM_STR);
    $stmt->bindParam(':NameTo',        $NameTo,        PDO::PARAM_STR);
    $stmt->bindParam(':posFrom',       $posFrom ,     PDO::PARAM_STR);
    $stmt->bindParam(':idmemFrom',     $idmemFrom ,     PDO::PARAM_STR);
    //$stmt->bindParam(':posTo',         $posTo ,     PDO::PARAM_STR);
    //$stmt->bindParam(':idmemTo',       $idmemTo ,     PDO::PARAM_STR);
    $stmt->bindParam(':phonefrom',     $phonefrom ,     PDO::PARAM_STR);
    //$stmt->bindParam(':phoneto',       $phoneto ,     PDO::PARAM_STR);
    $stmt->bindParam(':nameby',        $nameby ,     PDO::PARAM_STR);
    $result = $stmt->execute();
     // sweet alert 
    echo '
    <script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/1.1.3/sweetalert-dev.js"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/sweetalert/1.1.3/sweetalert.css">';

    if($result){
        echo '<script>
             setTimeout(function() {
              swal({
                  title: "เพิ่มข้อมูลสำเร็จ",
                  type: "success"
              }, function() {
                  window.location = "afrom.php"; //หน้าที่ต้องการให้กระโดดไป
              });
            }, 1000);
        </script>';
    }else{
       echo '<script>
             setTimeout(function() {
              swal({
                  title: "เกิดข้อผิดพลาด",
                  type: "error"
              }, function() {
                  window.location = "afrom.php"; //หน้าที่ต้องการให้กระโดดไป
              });
            }, 1000);
        </script>';
    }
    $conn = null; //close connect db
    }}  //isset
    ?>

//check duplicat
     $stmt = $conn->prepare("SELECT bookID  FROM bookout_2565 WHERE Numberbk = :Numberbk");
    
     $stmt->execute(array(':Numberbk' => $Numberbk));
     
     if($stmt->rowCount() > 0){
         echo '<script>
                      setTimeout(function() {
                       swal({
                           title: "กรอกข้อมูลซ้ำ",  
                           text: "เลขที่หนังสือนี้ถูกใช้แล้ว กรุณาลองใหม่",
                           type: "warning"
                       }, function() {
                           window.location = "aformAdd.php"; 
                       });
                     }, 1000);
               </script>';
     }else{