Mrthdrb

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.