I have a problem in below code

See more:

Javascript

HTML

PHP

MySQL

Anytime I Open My Page I Encounter This Error.

Undefined index: mobile in C:\xampp\htdocs\Church\views\CreateAccount.php on line 4

What I have tried:

<?php
include '../dbcon.php';
session_start();
$mobile = mysqli_real_escape_string($con, $_SESSION['mobile']);
$result =@mysqli_query($con,"SELECT memberid FROM members WHERE mobilenumber='$mobile'");
$id = '';
while ($row = mysqli_fetch_array($result)){
$id = $row["memberid"];
}
?>




<title>Create Account








<?php
if(isset($_POST['create'])) {
$username = mysqli_real_escape_string($con, $_POST['userid']);
$pwd = mysqli_real_escape_string($con, $_POST['pwd']);
$role = "member";
$query = "INSERT INTO accounts(username,memberid,password,role) values('$username',$id,'$pwd','$role')";
if (mysqli_query($con, $query)) {
header("Location:../Login.php");
} else {
echo '$(\'#alert\').html(\'<div class="alert alert-danger alert-dismissible">An Error Occured Please Try Again Or Username Already Exists</div>\'); ';
}
}
?>


function Validate() {
var pwd = document.getElementById('pwd').value;
var cpwd = document.getElementById('cpwd').value;
if(pwd != cpwd)
{
var a = $('#alert').html('<div class="alert alert-danger alert-dismissible">Password MisMatch</div>');
$('#pwd').focus();
setInterval(function(){
$('#alert').html('');
}, 3000);
$('#frm').submit(function (e) {
e.preventDefault();
return false;
})
}
else
{
$('#frm').submit(function (ev) {
ev.submit();
})
}
}