Kdjykuj

I created a custom menu but got this error.

Fatal error: Class NewsLatestNewsControllerAdminhtmlNews contains
1 abstract method and must therefore be declared abstract or implement
the remaining methods (MagentoFrameworkAppActionInterface::execute)
in
C:xampphtdocsmagento3appcodeNewsLatestNewsControllerAdminhtmlNews.php
on line 12

these are the codes

NewsLatestNewsControllerAdminhtmlNews.php

<?php 

namespace NewsLatestNewsControllerAdminhtml;



use MagentoBackendAppAction;

use MagentoBackendAppActionContext;

use MagentoFrameworkRegistry;

use MagentoFrameworkViewResultPageFactory;

use NewsLatestNewsModelNewsFactory;



abstract class News extends Action

{

/**

 * Core registry

 *

 * @var MagentoFrameworkRegistry

 */

protected $_coreRegistry;



/**

 * Result page factory

 *

 * @var MagentoFrameworkViewResultPageFactory

 */

protected $_resultPageFactory;



/**

 * News model factory

 *

 * @var NewsLatestNewsModelNewsFactory

 */

protected $_newsFactory;



/**

 * @param Context $context

 * @param Registry $coreRegistry

 * @param PageFactory $resultPageFactory

 * @param NewsFactory $newsFactory

 */

public function __construct(Context $context,

    Registry $coreRegistry,

    PageFactory $resultPageFactory,

    NewsFactory $newsFactory

) {

   parent::__construct($context);

    $this->_coreRegistry = $coreRegistry;

    $this->_resultPageFactory = $resultPageFactory;

    $this->_newsFactory = $newsFactory;

}



/**

 * News access rights checking

 *

 * @return bool

 */

    protected function _isAllowed()

{

    return         $this->_authorization->isAllowed('News_LatestNews::manage_news');

}

}

NewsLatestNewsControllerAdminhtmlNewsIndex.php

<?php



namespace NewsLatestNewsControllerAdminhtmlNews;



use NewsLatestNewsControllerAdminhtmlNews;



class Index extends News

{

/**

 * @return void

 */

public function execute()

{

  if ($this->getRequest()->getQuery('ajax')) {

        $this->_forward('grid');

        return;

    }



    /** @var MagentoBackendModelViewResultPage $resultPage */

    $resultPage = $this->_resultPageFactory->create();

    $resultPage->setActiveMenu('News_LatestNews::main_menu');

    $resultPage->getConfig()->getTitle()->prepend(__('Simple News'));



    return $resultPage;

   }

}

NewsLatestNewsBlockAdminhtmlNewsNews.php

<?php



namespace NewsLatestNewsBlockAdminhtml;



use MagentoBackendBlockWidgetGridContainer;



class News extends Container

{

   /**

     * Constructor

     *

     * @return void

     */

   protected function _construct()

      {

        $this->_controller = 'adminhtml_news';

        $this->_blockGroup = 'News_LatestNews';

        $this->_headerText = __('Manage News');

        $this->_addButtonLabel = __('Add News');

        parent::_construct();

      }

   }

NewsLatestNewsetcadminhtmlmenu.xml

<?xml version="1.0"?>



<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../Backend/etc/menu.xsd">

    <menu>

        <add id="News_LatestNews::main_menu" title="Simple News" 

            module="News_LatestNews" sortOrder="20" 

            resource="News_LatestNews::simplenews" />

        <add id="News_LatestNews::add_news" title="Add News" 

            module="News_LatestNews" sortOrder="1" parent="News_LatestNews::main_menu" 

            action="simplenews/news/new" resource="News_LatestNews::manage_news" />

        <add id="News_LatestNews::manage_news" title="Manage News" 

            module="News_LatestNews" sortOrder="2" parent="News_LatestNews::main_menu" 

            action="simplenews/news/index" resource="News_LatestNews::manage_news" />

        <add id="News_LatestNews::configuration" title="Configurations" 

            module="News_LatestNews" sortOrder="3" parent="News_LatestNews::main_menu" 

            action="adminhtml/system_config/edit/section/simplenews" 

            resource="News_LatestNews::configuration" />

    </menu>

</config>

NewsLatestNewsetcadminhtmlroutes.xml

<?xml version="1.0"?>



<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../../lib/internal/Magento/Framework/App/etc/routes.xsd">

    <router id="admin">

        <route id="simplenews" frontName="simplenews">

            <!-- <module name="Tutorial_SimpleNews" /> -->

            <module name="News_LatestNews" />

        </route>

    </router>

</config>

NewsLatestNewsetcacl.xml

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Acl/etc/acl.xsd">

<acl>

    <resources>

        <resource id="Magento_Backend::admin">

            <resource id="News_LatestNews::simplenews" title="Simple News" 

                sortOrder="100">

                <resource id="News_LatestNews::add_news" title="Add News" 

                    sortOrder="1" />

                <resource id="News_LatestNews::manage_news" title="Manage News" 

                    sortOrder="2" />

                <resource id="News_LatestNews::configuration" title="Configurations" 

                    sortOrder="3" />

            </resource> 



            <resource id="Magento_Backend::stores">

                <resource id="Magento_Backend::stores_settings">

                    <resource id="Magento_Config::config">

                        <resource id="News_LatestNews::config" title="News Configuration" sortOrder="50" />

                    </resource>

                </resource>

            </resource>

      </resource>       

    </resources>

</acl>

</config>

NewsLatestNewsetcmodule.xml

<?xml version="1.0"?>



<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">

    <module name="News_LatestNews" setup_version="1.0.2" active="true">

    </module>

</config>

Edit:

1 exception(s):

    Exception #0 (InvalidArgumentException): Boolean value is expected, supported values: array (

      0 => true,

      1 => 1,

      2 => 'true',

      3 => '1',

      4 => false,

      5 => 0,

      6 => 'false',

      7 => '0',

    )

The error is self-explained. NewsLatestNewsControllerAdminhtmlNews extends from abstract class MagentoBackendAppAction which implements MagentoFrameworkAppActionInterface::execute(). So, in your custom controller class need to have execute() method.

Or, NewsLatestNewsControllerAdminhtmlNews is an abstract class.