FromHelper cloud not be found error in CakePHP

<?php

classPostsController extensions AppController {
    public$helpers=array('Html','Form');

    public function index() {
        $this->set('posts', $this->Post->find('all'));
        // $this->set('title', 'List of Articles');
    }

    public function view($id=null){
        $this->Post->id=$id;
        $this->set('post', $this->Post->read());

    }

    public function add() {
        if($this->request->is('post'))){
            if($this->Post->save($this->request->data)){
                $this->Session->setFlash('Success!');
                $this->redirect(array('action'=>'index'));
            } else{
                $this->Session->setFlash('failed!');
            }
        }
    }
}

?>

<h2>Add post</h2>

<?php
echo$this->From->create('Post');
echo$this->From->input('title');
echo$this->From->input('body',array('rows'=>3));
echo$this->From->end('Save Post');


?>

<h2>List of Articles</h2>

<ul>
<?php foreach($posts as$post): ?>
<li>
<?php
// echo ($post['Post']['title']);
echo$this->Html->link($post['Post']['title'], '/posts/view/'.$post['Post']['id']);
?>

</li>
<?php endforeach;?>
</ul>

<h2>Add Post</h2>
<?php echo$this->Html->link('Add post', array('controller'=>'posts','action'=>'add'));?>