สอบถามปัญหา Warning: mkdir(): No such file or directory

<?
 include "../include/connect.php";
 include "sessionuser.php";
 include "functionavp32.php";
	$user_send = $_POST['user_send'];
	$vision = $_POST['vision'];
	if($_FILES[pdf][name]!=""){
			for($i=0;$i<count($user_send);$i++){
					if ($vision[$i] != 1 ){
							if ($vision[$i] != 2 ){
								echo "<script> alert('ยังไม่ได้เลือกสถานะการเห็นไฟล์ลับ   กรุณาเลือกด้วยครับ');</script>";
								echo "<script>setTimeout(\"location='user_send.php'\",100);</script>";
								exit;
																}
									}
			}
}
$month = date("F");
$year = date("Y");
$user_folder = $_SESSION["sess_id"] ;
$file = "../pdf/$user_folder/$year";
if (!file_exists($file)){
	mkdir("../pdf/$user_folder/$year");
}
$file1 = "../pdf/$user_folder/$year/$month";
if (!file_exists($file1)){
	mkdir("../pdf/$user_folder/$year/$month");
}

for($i=0;$i<5;$i++){
	$x.=rand(0,9);
	$y.=rand(0,9);
}		
$bookname = "$x.pdf";
$bookpdf= "$y.pdf";



if($_FILES[pdf][name]==""){
	move_uploaded_file($_FILES[book][tmp_name],"../pdf/$user_folder/$year/$month/$bookname");
$sql = " insert into book( book_id, book_name , book_detail, typebook_id) VALUES ( null, '$bookname', '$_POST[book_detail]', '$_POST[typebook_id]');";
$result = mysqli_query($conn,$sql);

$res =mysqli_insert_id($conn);
$today = date(" d F Y "); 
$time = date(" G:i:s"); 
$sender = $_SESSION["sess_id"];
$key = $_SESSION["sess_email"];

$sql = " insert into send ( send_id, user_id, book_id , subject , send_key, send_date, send_time) VALUES ( null, '$sender', '$res' , '$_POST[subject]','$key', '$today' , '$time');";
$result = mysqli_query($conn,$sql); 

$res2 =mysqli_insert_id($conn);
for($i=0;$i<count($user_send);$i++){
$sql = " insert into send_detail ( send_id , user_id , vision , open , approve) VALUES ( '$res2', '$user_send[$i]', '0', '0' ,'$_POST[approve]' );";
$result = mysqli_query($conn,$sql);
}
if($result)
{
//echo "<font color='red'>กำลังส่งหนังสือเวียน</font><br > <br >กรุณารอสักครู่<br><img src='../images/loading42.gif' />";
//echo "<script>setTimeout(\"location='user_book_out.php'\",1000);</script>";
}
else
{
//echo "<font color='red'>ไม่สามารถส่งหนังสือเวียนได้</font><br > <br >กรุณารอสักครู่<br><img src='../images/loading42.gif' />";
//echo "<script>setTimeout(\"location='user_send.php'\",1000);</script>";
}

//จบ ส่งแบบธรรมดา
}else{	

//เริ่มส่งแบบไฟล์ลับ
$key = $_SESSION["sess_email"];

move_uploaded_file($_FILES[book][tmp_name],"../pdf/$user_folder/$year/$month/$bookname");
move_uploaded_file($_FILES[pdf][tmp_name],"../pdf/$user_folder/$year/$month/$bookpdf");
$sql = " insert into book( book_id, book_name, book_pdf , book_detail, typebook_id) VALUES ( null, '$bookname','$bookpdf', '$_POST[book_detail]', '$_POST[typebook_id]');";
$result = mysqli_query($conn,$sql);

$res =mysqli_insert_id($conn);
$today = date(" d F Y "); 
$time = date(" G:i:s"); 

$sender = $_SESSION["sess_id"];
$sql = " insert into send ( send_id, user_id, book_id , subject ,send_key, send_date, send_time) VALUES ( null, '$sender', '$res' , '$_POST[subject]','$key' ,'$today' , '$time');";
$result = mysqli_query($conn,$sql); 
$res2 =mysqli_insert_id($conn);
for($i=0;$i<count($user_send);$i++){
$sql = " insert into send_detail ( send_id , user_id , vision , open , approve) VALUES ( '$res2', '$user_send[$i]', '$vision[$i]', '0' ,'$_POST[approve]' );";
$result = mysqli_query($conn,$sql);
}
if($result)
{
//echo "<font color='red'>กำลังส่งหนังสือเวียน</font><br > <br >กรุณารอสักครู่<br><img src='../images/loading42.gif' />";
//echo "<script>setTimeout(\"location='user_book_out.php'\",1000);</script>";
}
else
{
//echo "<font color='red'>ไม่สามารถส่งหนังสือเวียนได้</font><br > <br >กรุณารอสักครู่<br><img src='../images/loading42.gif' />";
//echo "<script>setTimeout(\"location='user_send.php'\",1000);</script>";
}
}
?>