php - Read works, add, edit, delete do not in Grocery Crud library Codeigniter -

i have done example , installed everything.

the read or display method of table works correctly, whenever try add, delete or edit registry windows appears , say:

404 page not found  page requested not found. 

here controller

class welcome extends ci_controller {      public function __construct()     {         parent::__construct();         $this->load->model('grocery_crud_model');         $this->load->database();         $this->load->helper('url');         $this->load->library('grocery_crud');     }       public function index()     {         $crud = new grocery_crud();          $crud->set_theme('datatables');         $crud->set_table('students');         $crud->set_relation('class','class','class');         $crud->display_as('name','name of student');         $crud->set_subject('students');         $crud->columns('name','class','roll_no');         $crud->add_fields('name','class','roll_no');         $crud->required_fields('name','class','roll_no');         $crud->unset_export();         $crud->unset_print();         $output = $crud->render();         $this->load->view('home', $output);      }  } 

when click add button url becomes

http://localhost/index.php/add 

what missed? new in codeigniter , grocery crud...

create function in welcome controller , move of code index() function new function like:

public function myfunction()     {         $crud = new grocery_crud();          $crud->set_theme('datatables');         $crud->set_table('students');         $crud->set_relation('class','class','class');         $crud->display_as('name','name of student');         $crud->set_subject('students');         $crud->columns('name','class','roll_no');         $crud->add_fields('name','class','roll_no');         $crud->required_fields('name','class','roll_no');         $crud->unset_export();         $crud->unset_print();         $output = $crud->render();         $this->load->view('home', $output);      } 

and redirect index() function method:

public function index()     {            redirect("welcome/myfunction");     } 

access grocery crud page @

http://localhost/index.php/welcome/newfunction

or simply

http://localhost/index.php/welcome

you're go now.