Session variables are blank

[Kdog]

<?php

   include("config.php");

   session_start();

   $error='';

   if($_SERVER["REQUEST_METHOD"] == "POST") {

   

      // username and password sent from form textbox

      $email = mysqli_real_escape_string($db,$_POST['email']);

      $pass = mysqli_real_escape_string($db,$_POST['pass']);

     

      $sql = "SELECT * FROM users WHERE email = '$email' and pass = '$pass'";

      $result = mysqli_query($db,$sql);      

      $row = mysqli_num_rows($result);      

      $count = mysqli_num_rows($result);

      //read user from database record

      $sql = "SELECT name, gender, age, user, email, pass FROM users where email='$email'";

      $result = mysqli_query($db,$sql);      

      $row = mysqli_num_rows($result);      

      $count = mysqli_num_rows($result);

      $name= $row['name'];

      $gender= $row['gender'];

      $age= $row['age'];

      $user= $row['user'];

      $email= $row['email'];

      $pass= $row['pass'];

      if($count == 1) {

     

         // session variables of user for chatroom

         $_SESSION['name'] = $name;

         $_SESSION["gender"] = $gender;

         $_SESSION["age"] = $age;

         $_SESSION['user'] = $user;

         $_SESSION['email'] = $email;

         header("location: chatroom.php");

      } else {

         $error = "Your Email or Passwsord is invalid";

      }

   }

?>



//display code
<div class="welcome-container">

    <div class="users" id="users">

       <!-- //welcome message to logged in user -->

         Welcome:

         <?php

         echo $_SESSION['user'];

        ?>

    </div>

    </div>