Magento 2 admin menu action result Invalid security or form key. Please refresh the page. on click

Question

I have succesfully added a new admin menu. But the problem is whenever i clicked the admin menu button, I got Invalid security or form key. Please refresh the page.

Here're some of my codes.

This is my menu.xml

     <add id="Testing_Basic::menu_item" title="Manage Items" module="Testing_Basic" sortOrder="10" parent="Testing_Basic::menu" action="Webpage/Create/Index" resource="Testing_Basic::menu_item"/>

And this is my directories looks like.

This is my

Controller/Adminhtml/Webpage/Index.php

<?php
/**
* Webkul Grid Controller
*
* @category    Webkul
* @package     Webkul_Grid
* @author      Webkul Software Private Limited
*
*/
namespace Testing\Basic\Controller\Adminhtml\Webpage;

class Index extends \Magento\Backend\App\Action
{
/**
 * @var \Magento\Framework\View\Result\PageFactory
 */
protected $_resultPageFactory;

/**
 * @param \Magento\Backend\App\Action\Context        $context
 * @param \Magento\Framework\View\Result\PageFactory $resultPageFactory
 */
public function __construct(
    \Magento\Backend\App\Action\Context $context,
    \Magento\Framework\View\Result\PageFactory $resultPageFactory
)
{
    parent::__construct($context);
    $this->_resultPageFactory = $resultPageFactory;
}

/**
 * Grid List page.
 *
 * @return \Magento\Backend\Model\View\Result\Page
 */
public function execute()
{
    /** @var \Magento\Backend\Model\View\Result\Page $resultPage */
    $resultPage = $this->_resultPageFactory->create();
    $resultPage->setActiveMenu('Testing_Basic::grid_list');
    $resultPage->getConfig()->getTitle()->prepend(__('Grid List'));

    return $resultPage;
}

/**
 * Check Grid List Permission.
 *
 * @return bool
 */
    protected function _isAllowed()
    {
        return $this->_authorization->isAllowed('Testing_Basic::grid_list');
    }
  }

And this is my routes.xml

    <?xml version="1.0"?>
    <!--
    /**
    * Webkul_Grid route xml
    *
    * @category    Webkul
    * @package     Webkul_Grid
    * @author      Webkul Software Private Limited
    *
    */
    -->
    <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:noNamespaceSchemaLocation="urn:magento:framework:App/etc/routes.xsd">
     <router id="admin">
       <route id="create" frontName="create">
       <module name="Testing_Basic" />
       </route>
       </router>
    </config>

Answer 1

add code in menu.xml

 <add 
    id="Testing_Basic::item" 
    title="Manage Items" 
    module="Testing_Basic" 
    sortOrder="10" 
    parent="Testing_Basic::menu" 
    action="create/webpage/index" 
    resource="Testing_Basic::item"
    />

etc/adminhtml/routes.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/etc/routes.xsd">
    <router id="admin">
        <route id="create" frontName="create">
            <module name="Testing_Basic" />
        </route>
    </router>
</config>

and controler file path like

/Controller/Adminhtml/Webpage/Index.php

<?php
namespace Testing\Basic\Controller\Adminhtml\Webpage;

use Magento\Framework\App\Action\HttpGetActionInterface as HttpGetActionInterface;
use Magento\Backend\App\Action\Context;
use Magento\Framework\View\Result\PageFactory;
use Magento\Backend\App\Action;
class Index extends Action implements HttpGetActionInterface
{
    /**
     * @var PageFactory
     */
    protected $resultPageFactory;

    /**
     * @param Context $context
     * @param PageFactory $resultPageFactory
     */
    public function __construct(
        Context $context,
        PageFactory $resultPageFactory
    ) {
        parent::__construct($context);
        $this->resultPageFactory = $resultPageFactory;
    }

    /**
     * Index action
     *
     * @return \Magento\Backend\Model\View\Result\Page
     */
    public function execute()
    {
        $resultPage = $this->resultPageFactory->create();
        $resultPage->setActiveMenu('Testing_Basic::item');
        $resultPage->addBreadcrumb(__('Grid List'), __('Grid List'));
        $resultPage->addBreadcrumb(__('Manage Grid'), __('Manage Grid'));
        $resultPage->getConfig()->getTitle()->prepend(__('Grid List'));

        return $resultPage;
    }
}

hope this help you. :)

Answer 2

It might help someone, Today, I faced the same issue Magento ver. 2.3.5 none of the above methods works for me: Then I checked the module controller and found this code :

 /**
     * {@inheritdoc}
     */
    public function _isAllowed()
    {
        return $this->_authorization->isAllowed('Mymodule_Test::Test');
    }

Solution: Update Users Role from admin and it will resolve the issue.

Answer 3

I had this issue in Magento 2.4.0. The reason was because the module folder was not correctly named. For example: the name should have been DemoModule and the incorrect name was ModuleDemo.