YII Trouble using CUploadedFile::getInstance in Multi FIeld - yii

Question

I need help, i have 50 filefield when i save with looping filefield at 26 to 50 do not save file , but filefield 1 to 25 save to datbase. In localhost xampp it run correcly but the trouble when i hosting to webserver. anybody knows what the problem ?. this is my code in controller and form
//form
<table>
<tr>
<td>
<?php echo $form->labelEx($model,'mutu1'); ?>
<?php echo CHtml::dropDownList(
'NilaiStandarMutu[mutu1]',$model->mutu1,
array(
''=>'Pilihan',
'Ada'=>'Ada',
'Tidak Ada'=>'Tidak Ada',
)
);
?>
<?php echo $form->error($model,'mutu1'); ?>
</td>
<td style="padding-top:18px;padding-left:100px;padding-right:0px">
<?php //echo $form->labelEx($model,'file_mutu1'); ?>
<?php echo $form->fileField($model,'file_mutu1',array('size'=>10)); ?>
<?php echo $form->error($model,'file_mutu1'); ?>
</td>
<?
if(!$model->isNewRecord)
{
?>
<td width=10%>
<? if($model->file_mutu1 <> "") {
echo CHtml::link('<i class="icon icon-search"></i> View File ',Yii::app()->baseUrl . "/FileUpload/".$model->file_mutu1, array('target'=>'_blank'));
} else
{
echo CHtml::link('<i class="icon icon-remove"></i> Tidak ada File ','#');
}
?>
</td>
<? } ?>
</tr>
<tr>
<td>
<?php echo $form->labelEx($model,'mutu2'); ?>
<?php echo CHtml::dropDownList(
'NilaiStandarMutu[mutu2]',$model->mutu2,
array(
''=>'Pilihan',
'Berjalan'=>'Berjalan',
'Tidak Berjalan'=>'Tidak Berjalan',
)
);
?>
<?php echo $form->error($model,'mutu2'); ?>
</td>
<td style="padding-top:18px;padding-left:100px">
<?php //echo $form->labelEx($model,'file_mutu1'); ?>
<?php echo $form->fileField($model,'file_mutu2',array('size'=>10)); ?>
<?php echo $form->error($model,'file_mutu2'); ?>
</td>
<?
if(!$model->isNewRecord)
{
?>
<td width=10%>
<? if($model->file_mutu2 <> "") {
echo CHtml::link('<i class="icon icon-search"></i> View File ',Yii::app()->baseUrl . "/FileUpload/".$model->file_mutu2, array('target'=>'_blank'));
} else
{
echo CHtml::link('<i class="icon icon-remove"></i> Tidak ada File ','#');
}
?>
</td>
<? } ?>
</tr>
//....... until 50
//controller
public function actionCreate()
{
$level = Yii::app()->user->getState("level");
$username = Yii::app()->user->name;
$month = substr(date('Y-m-d'),0,7);
$model=new NilaiStandarMutu;
if(isset($_POST['NilaiStandarMutu']))
{
$model->attributes=$_POST['NilaiStandarMutu'];
$file_standar_mutu->attributes=$_POST['FileStandarMutu'];
$i=1;
$uploadedFile = array();
$fileName = array();
for ($i = 1; $i <= 50; $i++)
{
$rnd = rand(0,9999);
$nama = 'file_mutu' . '' .$i;
$uploadedFile[$i]=CUploadedFile::getInstance($model,$nama);
//var_dump($uploadedFile['$i']);
$fileName[$i] = "{$rnd}-{$uploadedFile[$i]}"; // random number + file name
if(!empty($uploadedFile[$i]))
{
$model->$nama = $fileName[$i];
}
}
if($model->save())
{
$arrlength = count($uploadedFile);
for($x = 0; $x <= $arrlength; $x++) {
if(!empty($uploadedFile[$x])) // check if uploaded file is set or not
{
$uploadedFile[$x]->saveAs(Yii::app()->basePath.'/../FileUpload/'.$fileName[$x]);
}
}
$this->redirect(array('view','id'=>$model->id_nilai_sm));
}
}
if(isset($_GET[mode])=="new")
{
if($level == "prodi")
{
$model->CekJadwal();
$criteria = new CDbCriteria();
$criteria->select = 'tgl_input ';
$criteria->condition ="username='$username' and left(tgl_input,7)='$month'";
$find = NilaiStandarMutu::model()->count($criteria);
if($find >= 1)
{
Yii::app()->user->setFlash('error','Tambah gagal !!, Data sudah ada di tahun yang sama !!');
$this->redirect(array("admin"));
}
}
}
$this->render('create',array(
'model'=>$model,
'file_standar_mutu' => $file_standar_mutu,
));
}