can't add new users in Vrestaurant

when I click on new button to create a new user in vrestaurant , i am getting below error :

Call to a member function getItems() on boolean

could you please assist ?

Hello,
Please share your backend & FTP login credentials via Contact us form, We'll look into it.

I am trying the extension in the localhost right now , my website is not yet published ... can you suggest other option to check this ?

here is the error message that I getting - I am attaching the screenshot of the error as well for your reference.

( ! ) Fatal error: Call to a member function getItems() on boolean in C:\wamp64\www\administrator\components\com_vrestaurant\models\user.php on line 301


# Time Memory Function Location
1 0.0003 248112 {main}( ) ...\index.php:0
2 0.1014 7792072 Joomla\CMS\Application\CMSApplication->execute( ) ...\index.php:51
3 0.1014 7792464 Joomla\CMS\Application\AdministratorApplication->doExecute( ) ...\CMSApplication.php:303
4 0.1491 10476744 Joomla\CMS\Application\AdministratorApplication->dispatch( ) ...\AdministratorApplication.php:159
5 0.1593 10971424 Joomla\CMS\Component\ComponentHelper::renderComponent( ) ...\AdministratorApplication.php:101
6 0.1628 11165272 Joomla\CMS\Component\ComponentHelper::executeComponent( ) ...\ComponentHelper.php:357
7 0.1634 11196064 require_once( 'C:\wamp64\www\administrator\components\com_vrestaurant\vrestaurant.php' ) ...\ComponentHelper.php:382
8 0.1934 12732296 Joomla\CMS\MVC\Controller\BaseController->execute( ) ...\vrestaurant.php:57
9 0.1934 12732432 VrestaurantController->display( ) ...\BaseController.php:710
10 0.1948 12758760 Joomla\CMS\MVC\Controller\BaseController->display( ) ...\controller.php:31
11 0.2066 13744296 VrestaurantViewUser->display( ) ...\BaseController.php:672
12 0.2391 15213808 Joomla\CMS\MVC\View\HtmlView->get( ) ...\view.html.php:57
13 0.2391 15214032 VrestaurantModelUser->getGroups( ) ...\HtmlView.php:423

Please let us know the Joomla version you have on your Website?

Setting Value

PHP Built On Windows NT PCONE 10.0 build 16299 (Windows 10) AMD64
Database Version 5.7.19
Database Collation utf8_general_ci
Database Connection Collation utf8mb4_general_ci
PHP Version 5.6.31
Web Server Apache/2.4.27 (Win64) PHP/5.6.31
WebServer to PHP Interface apache2handler
Joomla! Version Joomla! 3.8.5 Stable [ Amani ] 6-February-2018 15:00 GMT
Joomla! Platform Version Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
User Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0