在localhost上查看同一页面时出错

我的ctp文件代码：

<?php echo $this->Form->create('Users',array('action'=>'port_settings_edit')); ?>
<tr><td><center><?php echo $this->Form->input('process',array('type'=>'hidden','value'=>$pid,'id'=>'pid')); ?>
<?php echo $pname; ?></center></td><td><center>
<?php echo $characteristic; ?></center></td><td><center>
<select id="deviceid"></select></center></td><td><center><select id="instid">
<option value="">Select Any</option>
<option value="xyzz">xyzz</option>
<option value="fgh">fgh</option>
<option value="abc">abc</option>
</select></center></tr></table>
<BR><BR> &nbsp; &nbsp; &nbsp;
<button type="submit" id="submit_btn" class="bott1"><font size=3 ><b>SUBMIT</b></font></button>

• 我的控制器中定义的函数：

  function port_settings_edit($id=null)        
  {
      $this->loadModel('Process');
      $op=$this->Process->find('first',array('conditions'=>array('Process.id'=>$id)));
       $this->set('pname',$op['Process']['name']);//ERROR
       $this->set('pid',$op['Process']['id']);//ERROR
       $this->set('characteristic',$op['Process']['characteristic']);//ERROR
       if(!empty($this->data))
       { 
         //$this->layout = false; 
         //print_r($this->data);
         $this->Session->setFlash('PORTS SETTINGS ARE DONE SUCCESSFULLY.');
         $this->redirect(array('action'=>'viewport'));              
       }
  }
  

我在这三行遇到了同样的错误。即

未定义语法：处理

我已经定义了变量。