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I have overriden the contact form module, after disabling the default contact form validation and apply my custom validation gets the following error:

Fatal error: Uncaught TypeError: Argument 1 passed to
MagentoFrameworkDataObject::__construct() must be of the type array,
null given, called in
/var/www/html/magento/app/code/Amy/Contactform/Controller/Index/Post.php
on line 119 and defined in
/var/www/html/magento/vendor/magento/framework/DataObject.php:38 Stack
trace: #0
/var/www/html/magento/app/code/Amy/Contactform/Controller/Index/Post.php(119):
MagentoFrameworkDataObject->__construct(NULL) #1
/var/www/html/magento/app/code/Amy/Contactform/Controller/Index/Post.php(84):
AmyContactformControllerIndexPost->sendEmail(NULL) #2
/var/www/html/magento/vendor/magento/framework/Interception/Interceptor.php(58):
AmyContactformControllerIndexPost->execute() #3
/var/www/html/magento/vendor/magento/framework/Interception/Interceptor.php(138):
AmyContactformControllerIndexPostInterceptor->___callParent('execute',
Array) #4
/var/www/html/magento/vendor/magento/framework/Interception/Interceptor.php(153):
AmyContactformControllerIndexPostInterceptor->MagentoFramewor in
/var/www/html/magento/vendor/magento/framework/DataObject.php on line
38

Here is my code:

/var/www/html/magento/app/code/Amy/Contactform/Controller/Index/Post.php

:

<?php
/**
 *
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace AmyContactformControllerIndex;

use MagentoContactModelConfigInterface;
use MagentoContactModelMailInterface;
use MagentoFrameworkAppActionContext;
use MagentoFrameworkAppRequestDataPersistorInterface;
use MagentoFrameworkControllerResultRedirect;
use MagentoFrameworkExceptionLocalizedException;
use MagentoFrameworkHTTPPhpEnvironmentRequest;
use PsrLogLoggerInterface;
use MagentoFrameworkAppObjectManager;
use MagentoFrameworkDataObject;
use MagentoNewsletterModelSubscriberFactory;

class Post extends MagentoContactControllerIndexPost

 /**
 * @var DataPersistorInterface
 */
 private $dataPersistor;

 /**
 * @var Context
 */
 private $context;

 /**
 * @var MailInterface
 */
 private $mail;

 /**
 * @var LoggerInterface
 */
 private $logger;

 /**
 * @var MagentoNewsletterModelSubscriberFactory
 */
 protected $subscriberFactory;


 /**
 * @param Context $context
 * @param ConfigInterface $contactsConfig
 * @param MailInterface $mail
 * @param DataPersistorInterface $dataPersistor
 * @param LoggerInterface $logger
 */
 public function __construct(
 Context $context,
 ConfigInterface $contactsConfig,
 MailInterface $mail,
 DataPersistorInterface $dataPersistor,
 SubscriberFactory $subscriberFactory,
 LoggerInterface $logger = null
 ) 
 parent::__construct($context, $contactsConfig, $mail, $dataPersistor);
 $this->context = $context;
 $this->mail = $mail;
 $this->dataPersistor = $dataPersistor;
 $this->subscriberFactory = $subscriberFactory;
 $this->logger = $logger ?: ObjectManager::getInstance()->get(LoggerInterface::class);
 

 /**
 * Post user question
 *
 * @return Redirect
 */
 public function execute()
 

 if (!$this->isPostRequest()) 
 return $this->resultRedirectFactory->create()->setPath('*/*/');
 
 try 
 $this->sendEmail($this->validatedParams());

 // subscribe to newsletter---------CODE START
 if ($this->getRequest()->getParam('is_subscribed', false)) 
 $this->subscriberFactory->create()->subscribe($this->getRequest()->getParam('email'));
 
 // subscribe to newsletter---------CODE END


 $this->messageManager->addSuccessMessage(
 __('Thanks for contacting us. Your inquiry was submitted and will be responded to you as soon as possible.')
 );
 $this->dataPersistor->clear('contact_us');
 catch (LocalizedException $e) 
 $this->messageManager->addErrorMessage($e->getMessage());
 $this->dataPersistor->set('contact_us', $this->getRequest()->getParams());
 catch (Exception $e) 
 $this->logger->critical($e);
 $this->messageManager->addErrorMessage(
 __('An error occurred while processing your form. Please try again later.')
 );
 $this->dataPersistor->set('contact_us', $this->getRequest()->getParams());
 
 return $this->resultRedirectFactory->create()->setPath('contact/index');
 

 /**
 * @param array $post Post data from contact form
 * @return void
 */
 private function sendEmail($post)
 
 $this->mail->send(
 $post['subject'],
 $post['email'],
 ['data' => new DataObject($post)]
 );
 

 /**
 * @return bool
 */
 private function isPostRequest()
 
 /** @var Request $request */
 $request = $this->getRequest();
 return !empty($request->getPostValue());
 

 /**
 * @return array
 * @throws Exception
 */
 private function validatedParams()
 
 // $request = $this->getRequest();
 // if (trim($request->getParam('name')) === '') 
 // throw new LocalizedException(__('Name is missing'));
 // 
 // if (trim($request->getParam('lastname')) === '') 
 // throw new LocalizedException(__('LastName is missing'));
 // 
 // if (trim($request->getParam('address1')) === '') 
 // throw new LocalizedException(__('Address1 is missing'));
 // 
 // if (trim($request->getParam('address2')) === '') 
 // throw new LocalizedException(__('Address2 is missing'));
 // 
 // if (trim($request->getParam('city')) === '') 
 // throw new LocalizedException(__('City is missing'));
 // 
 // if (trim($request->getParam('stateprovince')) === '') 
 // throw new LocalizedException(__('State is missing'));
 // 
 // if (trim($request->getParam('zipcode')) === '') 
 // throw new LocalizedException(__('Zipcode is missing'));
 // 
 // if (trim($request->getParam('subject')) === '') 
 // throw new LocalizedException(__('Subject is missing'));
 // 
 // if (trim($request->getParam('comment')) === '') 
 // throw new LocalizedException(__('Comment is missing'));
 // 

 // if (false === strpos($request->getParam('email'), '@')) 
 // throw new LocalizedException(__('Invalid email address'));
 // 
 // if (trim($request->getParam('hideit')) !== '') 
 // throw new Exception();
 // 
 //return $request->getParams();
 

/var/www/html/magento/app/code/Amy/Contactform/view/frontend/templates/form.phtml:

<?php

$objectManager = MagentoFrameworkAppObjectManager::getInstance();
 $states = $objectManager->create('MagentoDirectoryModelRegionFactory')
 ->create()->getCollection()->addFieldToFilter('country_id','US');
//echo "<pre>";
//print_r($states->getData());
$regionList = $block->getRegion();
//$countryList = $block->getCountry();
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

// @codingStandardsIgnoreFile
/** @var MagentoContactBlockContactForm $block */
?>
<div class="container">
 <div class="row margincontrol">
<!-- <form class="form contact" 22-3-19-->
<form class=""
 action="<?= $block->escapeUrl($block->getFormAction()) ?>"
 id="contact-form"
 method="post"
 data-hasrequired="<?= $block->escapeHtmlAttr(__('* Required Fields')) ?>">
 <fieldset class="fieldset">
 <div class="legend empty_class"><h2 class="header_fontst"><?= $block->escapeHtml(__('Contact Us')) ?></h2></div> 

 <div class="col-sm-12 col-md-6 col-lg-6 hightposition field name required">
 <label class="label" for="name"><span class="font_app"><?= $block->escapeHtml(__('First Name')) ?></span></label>
 <div class="control">
 <input name="name" id="name" title="<?= $block->escapeHtmlAttr(__('Name')) ?>" value="<?= $block->escapeHtmlAttr($this->helper('MagentoContactHelperData')->getPostValue('name') ?: $this->helper('MagentoContactHelperData')->getUserName()) ?>" class="input-text" type="text"/>
 </div>
 </div>

 <div class="col-sm-12 col-md-6 col-lg-6 hightposition field lastname required">
 <label class="label boxspaing" for="last_name"><span class="font_app"><?= $block->escapeHtml(__('Last Name')) ?></span></label>
 <div class="control boxspaing">
 <input name="last_name" id="last_name" title="<?= $block->escapeHtmlAttr(__('LastName')) ?>" value="<?= $block->escapeHtmlAttr($this->helper('MagentoContactHelperData')->getPostValue('lastname') ?: $this->helper('MagentoContactHelperData')->getUserName()) ?>" class="input-text" type="text"/>
 </div>
 </div>

 <div class="col-sm-12 col-md-6 col-lg-6 hightposition field email required">
 <label class="label" for="email"><span class="font_app"><?= $block->escapeHtml(__('Email')) ?></span></label>
 <div class="control">
 <input name="email" id="email" title="<?= $block->escapeHtmlAttr(__('Email')) ?>" value="<?= $block->escapeHtmlAttr($this->helper('MagentoContactHelperData')->getPostValue('email') ?: $this->helper('MagentoContactHelperData')->getUserEmail()) ?>" class="input-text" type="email"/>
 </div>
 </div>

 <div class="col-sm-12 col-md-6 col-lg-6 hightposition field telephone required">
 <label class="label boxspaing" for="telephone"><span class="font_app"><?= $block->escapeHtml(__('Telephone')) ?></span></label>
 <div class="control boxspaing">
 <input name="telephone" id="telephone" title="<?= $block->escapeHtmlAttr(__('Phone Number')) ?>" value="<?= $block->escapeHtmlAttr($this->helper('MagentoContactHelperData')->getPostValue('telephone')) ?>" class="input-text" type="text"/>
 </div>
 </div>

 <div class="col-sm-12 col-md-6 col-lg-6 hightposition field address1 required">
 <label class="label" for="address1"><span class="font_app"><?= $block->escapeHtml(__('Address1')) ?></span></label>
 <div class="control">
 <input name="address1" id="address1" title="<?= $block->escapeHtmlAttr(__('Address1')) ?>" value="<?= $block->escapeHtmlAttr($this->helper('MagentoContactHelperData')->getPostValue('address1')) ?>" class="input-text" type="text"/>
 </div>
 </div>

 <div class="col-sm-12 col-md-6 col-lg-6 hightposition field address2">
 <label class="label boxspaing" for="address2"><span class="font_app"><?= $block->escapeHtml(__('Address2')) ?></span></label>
 <div class="control boxspaing">
 <input name="address2" id="address2" title="<?= $block->escapeHtmlAttr(__('Address2')) ?>" value="<?= $block->escapeHtmlAttr($this->helper('MagentoContactHelperData')->getPostValue('address2')) ?>" class="input-text" type="text"/>
 </div>
 </div>

 <div class="col-sm-12 col-md-6 col-lg-6 hightposition field city required">
 <label class="label" for="city"><span class="font_app"><?= $block->escapeHtml(__('City')) ?></span></label>
 <div class="control">
 <input name="city" id="city" title="<?= $block->escapeHtmlAttr(__('City')) ?>" value="<?= $block->escapeHtmlAttr($this->helper('MagentoContactHelperData')->getPostValue('city')) ?>" class="input-text" type="text"/>
 </div>
 </div>

 <div class="col-sm-12 col-md-6 col-lg-6 hightposition field stateprovince required">
 <label class="label boxspaing" for="stateprovince"><span class="font_app"><?php echo __('State / Province') ?></span></label>
 <div class="control boxspaing">
 <select class="select_img" name="stateprovince" id ="stateprovince" class="input-text" type="text">
 <option selected value>Select One</option>
 <?php foreach ($states as $_state):?>
 <option value="<?php echo $_state->getName();?>"><?php echo $_state->getName();?></option>
 <?php endforeach;?>
 </select>
 </div>
 </div>

 <div class="col-sm-12 col-md-6 col-lg-6 hightposition field zipcode required">
 <label class="label" for="zipcode"><span class="font_app"><?= $block->escapeHtml(__('Zipcode')) ?></span></label>
 <div class="control">
 <input name="zipcode" id="zipcode" title="<?= $block->escapeHtmlAttr(__('Zipcode')) ?>" value="<?= $block->escapeHtmlAttr($this->helper('MagentoContactHelperData')->getPostValue('zipcode')) ?>" class="input-text" type="text"/>
 </div>
 </div>


 <div class="col-sm-12 col-md-6 col-lg-6 hightposition field subject required">
 <label class="label boxspaing" for="subject"><span class="font_app"><?= $block->escapeHtml(__('Subject')) ?></span></label>
 <div class="control boxspaing">
 <select name="subject" id="subject" title="<?= $block->escapeHtmlAttr(__('Subject')) ?>" value="<?= $block->escapeHtmlAttr($this->helper('MagentoContactHelperData')->getPostValue('subject')) ?>" class="input-text" type="text"/>

 <option selected value>Select One</option>
 <option value="Repair">Repair</option>
 <option value="Warranty">Warranty</option>
 <option value="General Feedback">General Feedback</option>
 </select>
 </div>
 </div>

 <div class="col-sm-12 col-md-12 col-lg-12 field comment required" style="width: 100% !important;">
 <label class="label messagees" for="comment"><span class="font_app"><?= $block->escapeHtml(__('Message')) ?></span></label>

 <textarea name="comment" id="comment" title="<?= $block->escapeHtmlAttr(__('What’s on your mind?')) ?>" class="input-text" type="text"><?= $block->escapeHtml($this->helper('MagentoContactHelperData')->getPostValue('comment')) ?></textarea>

 </div>

<!--design code start -->
 <div class="col-sm-12 col-md-12 col-lg-12" style="margin-bottom: 5px;">
 <div class="control submitt"> 
 <!-- <input type="checkbox" name="" value="on"> -->
 <label class="submit_head phone_rig">
 <input type="checkbox" name="is_subscribed" id ="is_subscribed" checked="checked" value="on">Subscribe to receive exciting news.
 <span class="submit_class"></span>
 </label>
 </div>

 </div>
 <div class="col-sm-12 col-md-12 col-lg-12" style="margin-bottom: 5px;">
 <div class="control submitt"> 
 <!-- <input type="checkbox" name="" value="on"> -->
 <label class="submit_head phone_rig">
 <input type="checkbox" name="retailer" value="on" id="retailer"> Yes, I would like my information sent to an authorized retailer in my area. 
 <span class="submit_class"></span>
 </label>
 </div>

 </div>
 <div class="clearfix style_bottom"></div>
 <!-- dev code --> 

 <?= $block->getChildHtml('form.additional.info') ?>

 <div class="col-sm-12 col-md-12 col-lg-12">
 <div class="actions-toolbar">
 <div class="primary">
 <input type="hidden" name="hideit" id="hideit" value="" />
 <button type="submit" title="<?= $block->escapeHtmlAttr(__('Submit')) ?>" class="action submit primary">
 <span><?= $block->escapeHtml(__('Submit')) ?></span>
 </button>
 </div>
 </div>
 </div> 

 </fieldset>

</form>
</div>
</div>
<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.min.js"></script>
<script type="text/javascript">
require([
 'jquery'
], function($)

jQuery(document).ready(function()

jQuery("#contact-form").validate(

rules: 
 name: "required",
 last_name: "required",
 email: 
 required: true,
 email: true
 ,
 telephone:
 required:true,
 number:true
 ,
 address1: "required",
 city: "required",
 stateprovince: "required",
 zipcode: "required",
 subject: "required",
 comment: "required"
 ,
 messages: 
 name: "Please enter your First Name",
 last_name: "Please enter your Last Name",
 email: "Please enter a valid Email Address",
 telephone: 
 required: "Please enter your Phone Number",
 number:"Please enter numbers Only"
 ,
 address1: "Please enter your Address",
 city: "Please enter your City",
 stateprovince: "Please enter your State/Province",
 zipcode: "Please enter your Zipcode",
 subject: "Please enter your Subject",
 comment: "Please enter your Message"
,
 );
);

);
</script>

/var/www/html/magento/app/code/Amy/Contactform/Model/Mail.php:

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace AmyContactformModel;

use MagentoFrameworkMailTemplateTransportBuilder;
use MagentoFrameworkTranslateInlineStateInterface;
use MagentoStoreModelStoreManagerInterface;
use MagentoFrameworkAppObjectManager;
use MagentoFrameworkAppArea;
use MagentoContactModelConfigInterface;

class Mail extends MagentoContactModelMail implements MagentoContactModelMailInterface
null $storeManager
 */
 public function __construct(
 ConfigInterface $contactsConfig,
 TransportBuilder $transportBuilder,
 StateInterface $inlineTranslation,
 StoreManagerInterface $storeManager = null
 ) 
 $this->contactsConfig = $contactsConfig;
 $this->transportBuilder = $transportBuilder;
 $this->inlineTranslation = $inlineTranslation;
 $this->storeManager = $storeManager ?: ObjectManager::getInstance()->get(StoreManagerInterface::class);
 

 /**
 * Send email from contact form
 *
 * @param string $replyTo
 * @param array $variables
 * @return void
 */
 public function send($recipient, $replyTo, array $variables)

 /** @see MagentoContactControllerIndexPost::validatedParams() */
 $replyToName = !empty($variables['data']['name']) ? $variables['data']['name'] : null;
 if ($recipient == 'Repair')
 $emails = ['aaa@gmail.com']; // add your email list
 else if ($recipient == 'General Feedback')
 $emails = ['bbb@gmail.com','ccc@gmail.com']; // add your email list 
 else
 $emails = ['aaa@gmail.com'];
 

 $this->inlineTranslation->suspend();
 try 
 $transport = $this->transportBuilder
 ->setTemplateIdentifier($this->contactsConfig->emailTemplate())
 ->setTemplateOptions(
 [
 'area' => Area::AREA_FRONTEND,
 'store' => $this->storeManager->getStore()->getId()
 ]
 )
 ->setTemplateVars($variables)
 ->setFrom($this->contactsConfig->emailSender())
 ->addTo($emails)
 ->setReplyTo($replyTo, $replyToName)
 ->getTransport();

 $transport->sendMessage();
 finally 
 $this->inlineTranslation->resume();
 

Any one Help me on this please..

/var/www/html/magento/app/code/Amy/Contactform/etc/di.xml:

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
 <preference for="MagentoContactBlockContactForm" type="AmyContactformBlockContactForm" />
 <preference for="MagentoContactModelMail" type="AmyContactformModelMail" />
 <preference for="MagentoContactControllerIndexPost" 
 type="AmyContactformControllerIndexPost" />
</config>

Try this in your Post.php:

<?php
/**
 *
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace AmyContactformControllerIndex;

use MagentoContactModelConfigInterface;
use MagentoContactModelMailInterface;
use MagentoFrameworkAppActionContext;
use MagentoFrameworkAppRequestDataPersistorInterface;
use MagentoFrameworkControllerResultRedirect;
use MagentoFrameworkExceptionLocalizedException;
use MagentoFrameworkHTTPPhpEnvironmentRequest;
use PsrLogLoggerInterface;
use MagentoFrameworkAppObjectManager;
use MagentoFrameworkDataObject;
use MagentoNewsletterModelSubscriberFactory;

class Post extends MagentoContactControllerIndexPost
null $logger
 */
 public function __construct(
 Context $context,
 ConfigInterface $contactsConfig,
 MailInterface $mail,
 DataPersistorInterface $dataPersistor,
 SubscriberFactory $subscriberFactory,
 LoggerInterface $logger = null
 ) 
 parent::__construct($context, $contactsConfig, $mail, $dataPersistor);
 $this->contactsConfig = $contactsConfig;
 $this->context = $context;
 $this->mail = $mail;
 $this->dataPersistor = $dataPersistor;
 $this->subscriberFactory = $subscriberFactory;
 $this->logger = $logger ?: ObjectManager::getInstance()->get(LoggerInterface::class);
 

 /**
 * Post user question
 *
 * @return Redirect
 */
 public function execute()
 

 if (!$this->isPostRequest()) 
 return $this->resultRedirectFactory->create()->setPath('*/*/');
 
 try 
 $this->sendEmail($this->validatedParams());

 // subscribe to newsletter---------CODE START
 if ($this->getRequest()->getParam('is_subscribed', false)) 
 $this->subscriberFactory->create()->subscribe($this->getRequest()->getParam('email'));
 
 // subscribe to newsletter---------CODE END


 $this->messageManager->addSuccessMessage(
 __('Thanks for contacting us. Your inquiry was submitted and will be responded to you as soon as possible.')
 );
 $this->dataPersistor->clear('contact_us');
 catch (LocalizedException $e) 
 $this->messageManager->addErrorMessage($e->getMessage());
 $this->dataPersistor->set('contact_us', $this->getRequest()->getParams());
 catch (Exception $e) 
 $this->logger->critical($e);
 $this->messageManager->addErrorMessage(
 __('An error occurred while processing your form. Please try again later.')
 );
 $this->dataPersistor->set('contact_us', $this->getRequest()->getParams());
 
 return $this->resultRedirectFactory->create()->setPath('contact/index');
 

 /**
 * @param array $post Post data from contact form
 * @return void
 */
 private function sendEmail($post)
 
 $this->mail->send(
 $post['subject'],
 $post['email'],
 ['data' => new DataObject($post)]
 );
 

 /**
 * @return bool
 */
 private function isPostRequest()
 
 /** @var Request $request */
 $request = $this->getRequest();
 return !empty($request->getPostValue());
 

 /**
 * @return array
 * @throws Exception
 */
 private function validatedParams()
 
 /**$request = $this->getRequest();
 if (trim($request->getParam('name')) === '') 
 throw new LocalizedException(__('Name is missing'));
 
 if (trim($request->getParam('lastname')) === '') 
 throw new LocalizedException(__('LastName is missing'));
 
 if (trim($request->getParam('address1')) === '') 
 throw new LocalizedException(__('Address1 is missing'));
 
 if (trim($request->getParam('address2')) === '') 
 throw new LocalizedException(__('Address2 is missing'));
 
 if (trim($request->getParam('city')) === '') 
 throw new LocalizedException(__('City is missing'));
 
 if (trim($request->getParam('stateprovince')) === '') 
 throw new LocalizedException(__('State is missing'));
 
 if (trim($request->getParam('zipcode')) === '') 
 throw new LocalizedException(__('Zipcode is missing'));
 
 if (trim($request->getParam('subject')) === '') 
 throw new LocalizedException(__('Subject is missing'));
 
 if (trim($request->getParam('comment')) === '') 
 throw new LocalizedException(__('Comment is missing'));
 

 if (false === strpos($request->getParam('email'), '@')) 
 throw new LocalizedException(__('Invalid email address'));
 
 if (trim($request->getParam('hideit')) !== '') 
 throw new Exception();
 
 return $request->getParams();*/