Opencart : Permission Denied Error

Question

I have made a custom module on Opencart. But while Editing It's showing Following Error:

For that I have followed the steps also. But still getting same Error:

   1. Login to admin, go to System > User Group.
   2.  Edit your admin usergroup (probably Top Administrator group).
   3. Add permission to your new extension modules (both Access Permission and Modify Permission).

Here's my controller Demo if any problem there :

<?php
class Controllerextensionmodulehelloworld extends Controller {
    private $error = array(); // This is used to set the errors, if any.

    public function index() {
        // Loading the language file of helloworld
        $this->load->language('extension/module/helloworld'); 

        // Set the title of the page to the heading title in the Language file i.e., Hello World
        $this->document->setTitle($this->language->get('heading_title'));

        // Load the Setting Model  (All of the OpenCart Module & General Settings are saved using this Model )
        $this->load->model('setting/setting');

        // Start If: Validates and check if data is coming by save (POST) method
        if (($this->request->server['REQUEST_METHOD'] == 'POST') && $this->validate()) {
            // Parse all the coming data to Setting Model to save it in database.
            $this->model_setting_setting->editSetting('helloworld', $this->request->post);

            // To display the success text on data save
            $this->session->data['success'] = $this->language->get('text_success');

            // Redirect to the Module Listing
            $this->response->redirect($this->url->link('extension/module', 'token=' . $this->session->data['token'], 'SSL'));
        }

        // Assign the language data for parsing it to view
        $data['heading_title'] = $this->language->get('heading_title');

        $data['text_edit']    = $this->language->get('text_edit');
        $data['text_enabled'] = $this->language->get('text_enabled');
        $data['text_disabled'] = $this->language->get('text_disabled');
        $data['text_content_top'] = $this->language->get('text_content_top');
        $data['text_content_bottom'] = $this->language->get('text_content_bottom');      
        $data['text_column_left'] = $this->language->get('text_column_left');
        $data['text_column_right'] = $this->language->get('text_column_right');

        $data['entry_code'] = $this->language->get('entry_code');
        $data['entry_layout'] = $this->language->get('entry_layout');
        $data['entry_position'] = $this->language->get('entry_position');
        $data['entry_status'] = $this->language->get('entry_status');
        $data['entry_sort_order'] = $this->language->get('entry_sort_order');

        $data['button_save'] = $this->language->get('button_save');
        $data['button_cancel'] = $this->language->get('button_cancel');
        $data['button_add_module'] = $this->language->get('button_add_module');
        $data['button_remove'] = $this->language->get('button_remove');

        // This Block returns the warning if any
        if (isset($this->error['warning'])) {
            $data['error_warning'] = $this->error['warning'];
        } else {
            $data['error_warning'] = '';
        }

        // This Block returns the error code if any
        if (isset($this->error['code'])) {
            $data['error_code'] = $this->error['code'];
        } else {
            $data['error_code'] = '';
        }     

        // Making of Breadcrumbs to be displayed on site
        $data['breadcrumbs'] = array();
        $data['breadcrumbs'][] = array(
            'text'      => $this->language->get('text_home'),
            'href'      => $this->url->link('common/home', 'token=' . $this->session->data['token'], 'SSL'),
            'separator' => false
        );
        $data['breadcrumbs'][] = array(
            'text'      => $this->language->get('text_module'),
            'href'      => $this->url->link('extension/module', 'token=' . $this->session->data['token'], 'SSL'),
            'separator' => ' :: '
        );
        $data['breadcrumbs'][] = array(
            'text'      => $this->language->get('heading_title'),
            'href'      => $this->url->link('extension/module/helloworld', 'token=' . $this->session->data['token'], 'SSL'),
            'separator' => ' :: '
        );

        $data['action'] = $this->url->link('extension/module/helloworld', 'token=' . $this->session->data['token'], 'SSL'); // URL to be directed when the save button is pressed

        $data['cancel'] = $this->url->link('extension/module', 'token=' . $this->session->data['token'], 'SSL'); // URL to be redirected when cancel button is pressed

        // This block checks, if the hello world text field is set it parses it to view otherwise get the default 
        // hello world text field from the database and parse it
        if (isset($this->request->post['helloworld_text_field'])) {
            $data['helloworld_text_field'] = $this->request->post['helloworld_text_field'];
        } else {
            $data['helloworld_text_field'] = $this->config->get('helloworld_text_field');
        }   

        // This block parses the status (enabled / disabled)
        if (isset($this->request->post['helloworld_status'])) {
            $data['helloworld_status'] = $this->request->post['helloworld_status'];
        } else {
            $data['helloworld_status'] = $this->config->get('helloworld_status');
        }

        $data['header'] = $this->load->controller('common/header');
        $data['column_left'] = $this->load->controller('common/column_left');
        $data['footer'] = $this->load->controller('common/footer');

        $this->response->setOutput($this->load->view('extension/module/helloworld.tpl', $data));

    }

    /* Function that validates the data when Save Button is pressed */
    protected function validate() {

        // Block to check the user permission to manipulate the module
        if (!$this->user->hasPermission('modify', 'extension/module/helloworld')) {
            $this->error['warning'] = $this->language->get('error_permission');
        }

        // Block to check if the helloworld_text_field is properly set to save into database,
        // otherwise the error is returned
        if (!$this->request->post['helloworld_text_field']) {
            $this->error['code'] = $this->language->get('error_code');
        }
        /* End Block*/

        // Block returns true if no error is found, else false if any error detected
        if (!$this->error) {
            return true;
        } else {
            return false;
        }
    }
}

Answer 1

Go to

system->users->users group->Administrator->edit

Here you can see Access Permission & Modify Permission, Please select all here & save that's it. Now you can access your custom moudle.

Answer 2

Find

$this->response->redirect($this->url->link('extension/module', 'token=' . $this->session->data['token'], 'SSL'));

Replace

$this->response->redirect($this->url->link('extension/extension', 'token=' . $this->session->data['token'] . '&type=module', true));

For Cancel Button

Find

   $data['cancel'] = $this->url->link('extension/module', 'token=' . $this->session->data['token'], 'SSL'); // URL to be redirected when cancel button is pressed

Replace with

$data['cancel'] = $this->url->link('extension/extension', 'token=' . $this->session->data['token'] . '&type=module', true);

For save button action

Find

 $data['action'] = $this->url->link('extension/module/helloworld', 'token=' . $this->session->data['token'], 'SSL'); // URL to be directed when the save button is pressed

Replace

if (!isset($this->request->get['module_id'])) {
        $data['action'] = $this->url->link('extension/module/helloworld', 'token=' . $this->session->data['token'], true);
    } else {
        $data['action'] = $this->url->link('extension/module/helloworld', 'token=' . $this->session->data['token'] . '&module_id=' . $this->request->get['module_id'], true);
    }