Cjiudialog 500 Internal Server Error

First of all, sorry for my English.

in someview.php I have the following code, basically I create a link with a url to a controlerID / accionID, and that should open a modal CJuiDialog given widget in a div (in this case propiedadDialog)

<?php
echo CHtml::ajaxLink(
 	Yii::t('sacApp', 'Add Propiedad'),
 	$this->createUrl("propiedad/addNew", array("idgrupo"=>$model->id)),
 	array(
 	 	'onclick'=>'$("#propiedadDialog").dialog("open"); return false;',
 	 	'update'=>'#propiedadDialog'
 	),
 	array(
 	 	'id'=>'showPropiedadDialog',
 	)
);
?>
<div id="propiedadDialog"></div>

This is the code of my action in the controller(PropiedadController.php)

<?php
	public function actionAddNew($idgrupo, $_)
	{
		$model = new Propiedad;
		
		$this->performAjaxValidation($model);
		
		$flag = true;
		if(isset($_POST['Propiedad'])){
			$flag = false;
			$model->attributes=$_POST['Propiedad'];
			$model->idgrupo=$idgrupo;
			//Do something before save
			if($model->save()){
				
			}
		}
		if($flag){
			if(defined('YII_DEBUG')){
				Yii::app()->clientScript->scriptMap['jquery.min.js'] = false;
			}else{
				Yii::app()->clientScript->scriptMap['jquery.js'] = false;
			}
			$this->renderPartial('createDialog', array('model'=>$model), false, true);
		}
	}
?>

This is the createDialog.php called from the Controller

<?php
	$this->beginWidget('zii.widgets.jui.CJuiDialog',
	array(
		'id'=>'propiedadDialog',
		'options'=>array(
			'title'=>Yii::t('propiedad', 'Create Propiedad'),
			'autoOpen'=>true,
			'closeOnEscape'=>true,
			'modal'=>'true',
			'width'=>'auto',
			'height'=>'auto',
		),
	),
);
echo $this->renderPartial('_formDialog', array('model'=>$model));
$this->endWidget('zii.widgets.jui.CJuiDialog');
?>

Y este el _formDialog.php llamado desde createDialog.php

<?php
/* @var $this PropiedadController */
/* @var $model Propiedad */
/* @var $form CActiveForm */
?>

<div class="form">

<?php $form=$this->beginWidget('CActiveForm', array(
	'id'=>'propiedad-form',
	'enableAjaxValidation'=>true,
)); ?>

	<p class="note">Fields with <span class="required">*</span> are required.</p>

	<?php echo $form->errorSummary($model); ?>

	<div class="row">
		<?php echo $form->labelEx($model,'descripcion'); ?>
		<?php echo $form->textField($model,'descripcion',array('size'=>60,'maxlength'=>150)); ?>
		<?php echo $form->error($model,'descripcion'); ?>
	</div>

	<div class="row buttons">
		<?php //echo CHtml::submitButton($model->isNewRecord ? 'Create' : 'Save'); ?>
		<?php echo CHtml::ajaxSubmitButton(
			Yii::t('propiedad', 'Create Propiedad'),
			CHtml::normalizeUrl(array('propiedad/addnew', 'render'=>false)),
			array(
				'succes'=>'js:function(data){
					$("#propiedadDialog").dialog("close");
				}'
			),
			array(
				'id'=>'closePropiedadDialog'
			),			
		);?>
	</div>

<?php $this->endWidget(); ?>

</div>&lt!-- form -->

The problem I have is that when I click on the ajaxLink that must open the modal CJuiDialog, I returned the error "500 Internal Server Error"