How to set error css classes in Yii ActiveForm manually

yii-activeform-error-css-class.php

<?php $form=$this->beginWidget('CActiveForm', array(
	'id'=>'login-form',
	'enableClientValidation'=>true,
	'clientOptions'=>array(
		'validateOnSubmit'=>true,		
		'inputContainer'=>'.form-group',
		'errorCssClass'=>'has-error',
	),
	'errorMessageCssClass'=>'help-block',
)); ?>
	<div class="row">
		<div class="col-md-6">
			<h2><?php echo Helper::t("LOGIN"); ?></h2>
			<div class="form-group">
				<?php echo $form->labelEx($model,'username', array('class'=>'col-md-4 control-label')); ?>
				<div class="col-md-8">
					<?php echo $form->textField($model,'username', array('class'=>'form-control','autocomplete'=>'off')); ?>
				</div>
				<?php echo $form->error($model,'username'); ?>
			</div>
			<!-- ... -->
		</div>
	</div>
<?php $this->endWidget(); ?>