runtime error uncaught syntaxerror:Unexpected token <

I am new with titanium and i was just trying out one of the login tutorials i got online and i run into "runtime error uncaught syntaxerror:Unexpected token <" problem the tutorial is from mobile.tutsplus.com. everything works perfect but every-time i send the information to the server i get the error response. If I hardcode the values that I put in the form everything works fine. Any ideas?

$username = “Dave”;
$password = “Dave”; 
 
//instead of 
 
$username = $_POST['user'];
$password = $_POST['pass'];

The following is my code can anyone help thank you

app.js

// this sets the background color of the master UIView (when there are no windows/tab groups on it)
Titanium.UI.setBackgroundColor('#fff');
var tabGroup = Titanium.UI.createTabGroup();
 
var login = Titanium.UI.createWindow({
    title:'User Authentication Demo',
    tabBarHidden:true,
    url:'main_windows/login.js'
});
 
var loginTab = Titanium.UI.createTab({
    title:"Login",
    window:login
});
 
tabGroup.addTab(loginTab);
tabGroup.open();

login.js

var curWindow = Titanium.UI.currentWindow;
var scrollView = Titanium.UI.createScrollView({
  contentWidth:'auto',
  contentHeight:'auto',
  top:0,
  showVerticalScrollIndicator:true,
  showHorizontalScrollIndicator:true
});
var view = Titanium.UI.createView({
  width:"100%",
  height: "auto",
  top:10,
  paddingBottom: 15
});
 
var lbl_User = Titanium.UI.createLabel({
  text:'Username:',
  height:30,
  width:"98%",
  color:'#222',
  font: {fontSize:16},
  top: 10
});
var txt_User = Titanium.UI.createTextField({
  width: "98%",
  color: "#222",
  paddingLeft: 5,
  border: 1,
  borderColor: "gray",
  borderRadius: 3,
  font:{fontSize:16},
  height: 40,
  top: 40
});
var lbl_Pass = Titanium.UI.createLabel({
  text:'Password:',
  height:30,
  width:"98%",
  color:'#222',
  font:{fontSize:16},
  top: 90
});
var txt_Pass = Titanium.UI.createTextField({
  width: "98%",
  color: "#222",
  paddingLeft: 5,
  border: 1,
  borderColor: "gray",
  borderRadius: 3,
  passwordMask: true,
  font:{fontSize:16},
  height: 40,
  top: 120
});
var btn_Login = Titanium.UI.createButton({
  width: "98%",
  color: "#555",
  font:{fontSize: 22, fontWeight: "bold"},
  height: 50,
  top: 180,
  title: "Log In"
});
 
function getUserInfo(e){
  var user = txt_User.value;
  var pass = txt_Pass.value
  loginUser(user,pass);
}
btn_Login.addEventListener('click',getUserInfo);
 
/*
* Login Event Handling
*/
var loginReq = Titanium.Network.createHTTPClient();
loginReq.setTimeout(15000);
loginReq.onload = function()
{
    var json = this.responseText;
    var response = JSON.parse(json);
    if (response.logged == true)
    {
        alert("Welcome " + response.name + ". Your email is: " + response.email);
    }
    else
    {
        alert(response.message);
    }
};
 
loginReq.onerror = function()
{
    alert("Network error");
};
 
 
function loginUser(user,pass){
  if (user != '' && pass != '')
    {
        loginReq.open("POST","http://192.168.1.134/post_auth.php");
        var params = {
            username: user,
            password: Ti.Utils.md5HexDigest(pass)
        };
        loginReq.send(params);
    }
    else
    {
        alert("Username/Password are required");
    }
}
view.add(lbl_User);
view.add(txt_User);
view.add(lbl_Pass);
view.add(txt_Pass);
view.add(btn_Login);
scrollView.add(view);
 
curWindow.add(scrollView);

the PHP file

<?php
// Select your MySQL host, username and password
$con = mysql_connect('localhost','root','A712660@caritas');
if (!$con)
{
    echo "Failed to make connection.";
    exit;
}
// Select the database. Enter the name of your database (not the same as the table name)
$db = mysql_select_db('app');
if (!$db)
{
    echo "Failed to select db.";
    exit;
}
 
$username = $_POST['user'];
$password = $_POST['pass'];
 
$sql = "SELECT * FROM users WHERE username = '" . $username . "' AND password = '" . $password . "'";
$query = mysql_query($sql);
if (mysql_num_rows($query) > 0)
{
    $row = mysql_fetch_array($query);
    $response = array(
        'logged' => true,
        'name' => $row['name'],
        'email' => $row['email']
    );
    echo json_encode($response);
}
else
{
    $response = array(
        'logged' => false,
        'message' => 'Invalid Username and/or Password'
    );
    echo json_encode($response);
}
?>