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Unable to load a form in codeigniter from a controller

#1
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have a simple sign up/Login registration project in php/codeigniter

and I always get this particular error while clicking on the Sign in or the Register button

Error: "The requested URL /CI/user/login was not found on this server."

Here is the Controller file user.php

Code:
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

    class User extends CI_Controller{  
     public function __construct()
     {

      parent::__construct();
      $this->load->model('user_model');

     }

     public function index()

     {
      if(($this->session->userdata('user_name')!=""))
      {
       $this->welcome();
      }

      else{
       $data['title']= 'Home';
       $this->load->view('header_view',$data);
       $this->load->view("registration_view.php", $data);
       $this->load->view('footer_view',$data);
      }}

     public function welcome()
     {
      $data['title']= 'Welcome';
      $this->load->view('header_view',$data);
      $this->load->view('welcome_view.php', $data);
      $this->load->view('footer_view',$data);
     }

     public function login()
     {
      $email=$this->input->post('email');
      $password=md5($this->input->post('pass'));

      $result=$this->user_model->login($email,$password);
      if($result) $this->welcome();
      else        $this->index();
     }

     public function thank()
     {
      $data['title']= 'Thank';
      $this->load->view('header_view',$data);
      $this->load->view('thank_view.php', $data);
      $this->load->view('footer_view',$data);
     }

     public function registration()
     {
      $this->load->library('form_validation');
      // field name, error message, validation rules
      $this->form_validation->set_rules('user_name', 'User Name', 'trim|required|min_length[4]|xss_clean');
      $this->form_validation->set_rules('email_address', 'Your Email', 'trim|required|valid_email');
      $this->form_validation->set_rules('password', 'Password', 'trim|required|min_length[4]|max_length[32]');
      $this->form_validation->set_rules('con_password', 'Password Confirmation', 'trim|required|matches[password]');

      if($this->form_validation->run() == FALSE)
      {
       $this->index();
      }
      else
      {
       $this->user_model->add_user();
       $this->thank();
      }
     }

     public function logout()
     {
      $newdata = array(
      'user_id'   =>'',
      'user_name'  =>'',
      'user_email'     => '',
      'logged_in' => FALSE,
      );

      $this->session->unset_userdata($newdata );
      $this->session->sess_destroy();
      $this->index();
     }
    }
    ?>

Here is the view file registration_view.php

Code:
<html>
<div id="content">
<div class="signup_wrap">
<div class="signin_form">


<?php echo form_open("user/login"); ?>

  <label for="email">Email:</label>
  <input type="text" id="email" name="email" value=""/>

  <label for="password">Password:</label>
  <input type="password" id="pass" name="pass" value=""/>

  <input type="submit" class="" value="Sign in"/>

<?php echo form_close(); ?>




</div><!--<div class="signin_form">-->
</div><!--<div class="signup_wrap">-->





<div class="reg_form">
<div class="form_title">Sign Up</div>
<div class="form_sub_title">It's free and anyone can join</div>



<?php echo validation_errors('<p class="error">'); ?>
<?php echo form_open("user/registration");?>

  <p>
  <label for="user_name">User Name:</label>
  <input type="text" id="user_name" name="user_name" value="<?php echo set_value('user_name'); ?>" />
  </p>

  <p>
  <label for="email_address">Your Email:</label>
  <input type="text" id="email_address" name="email_address" value="<?php echo set_value('email_address'); ?>" />
  </p>

  <p>
  <label for="password">Password:</label>
  <input type="password" id="password" name="password" value="<?php echo set_value('password'); ?>" />
  </p>

  <p>
  <label for="con_password">Confirm Password:</label>
  <input type="password" id="con_password" name="con_password" value="<?php echo set_value('con_password'); ?>" />
  </p>

  <p>
  <input type="submit" class="greenButton" value="Submit" />
  </p>

<?php echo form_close(); ?>

</div><!--<div class="reg_form">-->
</div><!--<div id="content">-->

</html>

Here is the htacess file

Code:
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L,QSA]
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