Validation_Errors And Form_Error In Codeigniter

$this->load->helper('form'); 
$this->load->library('form_validation'); 
$this->form_validation->set rules('username', 'Username', 'required'); 
$this->form_validation->set rules('name', 'Name', 'required'); 
$this->form_validation->run();
$this->load->view('users');

<?php 
echo validation_errors(); 
echo form_open(); 
echo form_input('username', "); 
echo form_error('username',''); 
echo form_input('name', ''); 
echo form_submit('mysubmit', 'Click Me'); 
echo form close();?> 

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