Can't move_upload_file to hosting

if ($act=='update'){
$lokasi_file = $_FILES['image']['tmp_name'];
$tipe_file = $_FILES['image']['type'];
$nama_file = $_FILES['image']['name'];
$acak = rand(1,99);
$nama_file_unik = $acak.$nama_file;


if (empty($lokasi_file)){
$update=mysql_query("UPDATE slide SET judul='$_POST[judul]',
detail='$_POST[kata]',
link='$_POST[link]'
WHERE kd_slide = '$_POST[kd_slide]'");
}
else{
UploadImage1($nama_file_unik);
$update=mysql_query("UPDATE slide SET judul='$_POST[judul]',
detail='$_POST[kata]',
link='$_POST[link]',
image='$nama_file_unik'
WHERE kd_slide = '$_POST[kd_slide]'");
}
if($update ==FALSE){
echo '
<div class="wrapper-page">
<div class="ex-page-content text-center">
<h2>Gagal Edit Data</h2>
<br>
<p class="text-muted">
Hubungi admin untuk perbaiki.
</p>
<br>
<a class="btn btn-default waves-effect waves-light" href="admin.php"> Return Home</a>

</div>
</div>
';
}
header('location:admin.php?page=slide');
}



function UploadImage1($fupload_name){
//direktori gambar
$vdir_upload = "../images/slider/";
$vfile_upload = $vdir_upload . $fupload_name;

//chmod("$vfile_upload", 0644);

//Simpan gambar dalam ukuran sebenarnya
move_uploaded_file($_FILES["image"]["tmp_name"], $vfile_upload);

//identitas file asli
$im_src = imagecreatefromjpeg($vfile_upload);
$src_width = imageSX($im_src);
$src_height = imageSY($im_src);

//Simpan dalam versi small 1920 pixel
//Set ukuran gambar hasil perubahan
$dst_width = 1920;
$dst_height = ($dst_width/$src_width)*$src_height;

//proses perubahan ukuran
$im = imagecreatetruecolor($dst_width,$dst_height);
imagecopyresampled($im, $im_src, 0, 0, 0, 0, $dst_width, $dst_height, $src_width, $src_height);

//Simpan gambar
imagejpeg($im,$vdir_upload . "small_" . $fupload_name);

//Hapus gambar di memori komputer
imagedestroy($im_src);
imagedestroy($im);
}