Notice: Undefined index: uploaded_file

Question

<?php

require_once('connect.php');
if(isset($_SESSION['username']) & !empty($_SESSION['username'])){
    $fileName = $_FILES["uploaded_file"]["name"]; $fileTmpLoc =
    $_FILES["uploaded_file"]["tmp_name"]; $fileType =
    $_FILES["uploaded_file"]["type"];  $fileSize =
    $_FILES["uploaded_file"]["size"];  $fileErrorMsg =
    $_FILES["uploaded_file"]["error"]; $data = date("Y-m-d-H-i-s");

    $nr= rand(1, 30); $kaboom = explode(".", $fileName);  $fileExt =
    end($kaboom);    if (!$fileTmpLoc) { 
    echo "";
    exit();      
} else if($fileSize > 15242880) { 
    echo "Imagine > 15MB";
    unlink($fileTmpLoc); 
    exit();      
} else if (!preg_match("/.(gif|jpg|jpeg|png)$/i", $fileName) ) {

    echo "Format permis gif/png/jpeg/jpg";
    unlink($fileTmpLoc); 
    exit();      
} else if ($fileErrorMsg == 1) { 
    echo "Incercati din nou";
    exit(); 
}    
$moveResult = move_uploaded_file($fileTmpLoc, "galerie/uploads/$nr$username.jpeg");

if ($moveResult != true) {
    echo "Fisierul NU a fost incarcat";
    unlink($fileTmpLoc); 
    exit(); } 

    include_once("ak_php_img_lib_1.0.php"); $target_file =
    "galerie/uploads/$nr$username.jpeg"; $resized_file =
    "galerie/uploads/r$nr$username.jpeg"; $edit_target =
    "$nr$username.jpeg"; 
    $wmax = 300; 
    $hmax = 300;

    ak_img_resize($target_file, $resized_file, $wmax, $hmax, $fileExt);
    $_SESSION['editname'] = $edit_target; 
    header("Refresh:0");    
    exit();     
 } else {       
    session_destroy();          
    require "../login.php"; 
} 
?>

Until upload a file, I recived this errors:

Notice: Undefined index: uploaded_file in E:\LICENTA\xampp\htdocs\licentaCC\galerie\image_upload_script.php on line 42

Notice: Undefined index: uploaded_file in E:\LICENTA\xampp\htdocs\licentaCC\galerie\image_upload_script.php on line 43

Notice: Undefined index: uploaded_file in E:\LICENTA\xampp\htdocs\licentaCC\galerie\image_upload_script.php on line 44

Notice: Undefined index: uploaded_file in E:\LICENTA\xampp\htdocs\licentaCC\galerie\image_upload_script.php on line 45

Notice: Undefined index: uploaded_file in E:\LICENTA\xampp\htdocs\licentaCC\galerie\image_upload_script.php on line 46

Can anyone help me to solve this problem?