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Getting error “Please enter a correct entity model” while creating product csv import

I am creating a custom product import function. While importing the csv I am getting an error Please enter a correct entity model. This is what I have done

ModelImportProductImportProductImport.php

<?php
namespace TtmHelloPrintModelImport;
use Exception;
use MagentoFrameworkAppConfigScopeConfigInterface;
use MagentoFrameworkAppResourceConnection;
use MagentoFrameworkExceptionLocalizedException;
use MagentoFrameworkStdlibStringUtils;
use MagentoImportExportModelImport;
use MagentoImportExportModelImportAbstractEntity;
use MagentoImportExportModelImportErrorProcessingProcessingErrorAggregatorInterface;
use MagentoImportExportModelImportFactory;
use MagentoImportExportModelResourceModelHelper;
use PsrLogLoggerInterface;
use TtmHelloPrintModelImportProductImportRowValidatorInterface as ValidatorInterface;
use TtmHelloPrintModelHelloPrint;
class ProductImport extends AbstractEntity
{
const VARIANTKEY = 'variantkey';
const SKU = 'sku';
/** @inheritdoc */
protected $masterAttributeCode = VARIANTKEY;
/**
* Validation failure message template definitions
*
* @var array
*/
protected $_messageTemplates
= [
ValidatorInterface::ERROR_SKU_IS_EMPTY => 'Sku is empty',
ValidatorInterface::ERROR_VARIANTKEY_IS_EMPTY => 'Variant Key is empty',
ValidatorInterface::ERROR_INVALID_ROW => 'Either SKU or Variant Key is empty',
];
/**
* Permanent entity columns.
*
* @var string[]
*/
protected $_permanentAttributes = [self::SKU];
/** @inheritdoc */
protected $_availableBehaviors
= [
Import::BEHAVIOR_APPEND,
Import::BEHAVIOR_REPLACE,
Import::BEHAVIOR_DELETE
];
/**
* If we should check column names
*
* @var bool
*/
protected $needColumnCheck = false;
/**
* Valid column names
*
* @var array
*/
protected $validColumnNames
= [
self::SKU,
self::VARIANTKEY
];
/**
* @var Auth
*/
protected $_auth;
public function __construct(
StringUtils $string,
ScopeConfigInterface $scopeConfig,
ImportFactory $importFactory,
Helper $resourceHelper,
ResourceConnection $resource,
ProcessingErrorAggregatorInterface $errorAggregator,
// BulkDiscount $bulkDiscountModel,
// CollectionFactory $collectionFactory,
LoggerInterface $logger,
array $data = []
) {
$this->logger = $logger;
$this->objectManager = MagentoFrameworkAppObjectManager::getInstance();
parent::__construct($string, $scopeConfig, $importFactory, $resourceHelper, $resource, $errorAggregator, $data);
}
public function getEntityTypeCode()
{
// return 'product_import';
return 'catalog_product';
// return false;
}
public function getValidColumnNames()
{
return $this->validColumnNames;
}
/**
* Row validation.
*
* @param array $rowData
* @param int $rowNum
*
* @return bool
*/
public function validateRow(array $rowData, $rowNum)
{
$logger->log(100, print_r( "validateRow is called", 100 ) );
$code = false;
if (isset($this->_validatedRows[$rowNum])) {
return !$this->getErrorAggregator()->isRowInvalid($rowNum);
}
$this->_validatedRows[$rowNum] = true;
// BEHAVIOR_DELETE use specific validation logic
if (Import::BEHAVIOR_DELETE === $this->getBehavior()) {
if (!isset($rowData[self::VARIANTKEY])) {
$this->addRowError(ValidatorInterface::ERROR_VARIANTKEY_IS_EMPTY, $rowNum);
return false;
}
return true;
}
if (isset($rowData[self::SKU])) {
$code = $rowData[self::SKU];
}
if ($code === false) {
$this->addRowError(ValidatorInterface::ERROR_SKU_IS_EMPTY, $rowNum);
}
if ( !$rowData[self::VARIANTKEY] ) {
$this->addRowError(ValidatorInterface::VARIANTKEY, $rowNum);
}
return !$this->getErrorAggregator()->isRowInvalid($rowNum);
}
protected function _importData()
{
switch ($this->getBehavior()) {
case Import::BEHAVIOR_DELETE:
$this->deleteEntity();
break;
case Import::BEHAVIOR_REPLACE:
$this->replaceEntity();
break;
case Import::BEHAVIOR_APPEND:
$this->saveEntity();
break;
default:
break;
}
return true;
}
public function saveEntity()
{
$this->saveAndReplaceEntity();
return $this;
}
public function replaceEntity()
{
$this->saveAndReplaceEntity();
return $this;
}
public function deleteEntity()
{
$listCode = [];
while ($bunch = $this->_dataSourceModel->getNextBunch()) {
foreach ($bunch as $rowNum => $rowData) {
$this->validateRow($rowData, $rowNum);
if (!$this->getErrorAggregator()->isRowInvalid($rowNum)) {
$rowCode = $rowData[self::VARIANTKEY];
$listCode[] = $rowCode;
}
if ($this->getErrorAggregator()->hasToBeTerminated()) {
$this->getErrorAggregator()->addRowToSkip($rowNum);
}
}
}
if ($listCode) {
$this->deleteEntityFinish(array_unique($listCode));
}
return $this;
}
protected function saveAndReplaceEntity()
{
$behavior = $this->getBehavior();
$listCode = [];
while ($bunch = $this->_dataSourceModel->getNextBunch()) {
$entityList = [];
foreach ($bunch as $rowNum => $rowData) {
if (!$this->validateRow($rowData, $rowNum)) {
$this->addRowError(ValidatorInterface::ERROR_INVALID_ROW, $rowNum);
continue;
}
if ( $this->getErrorAggregator()->hasToBeTerminated() ) {
$this->getErrorAggregator()->addRowToSkip($rowNum);
continue;
}
$rowCode                = $rowData[self::SKU];
$listCode[]             = $rowCode;
$entityList[$rowCode][] = $rowData;
}
if ( $behavior === Import::BEHAVIOR_REPLACE ) {
if ( $listCode && $this->deleteEntityFinish( array_unique( $listCode ) ) ) {
$this->saveEntityFinish($entityList);
}
} elseif ($behavior === Import::BEHAVIOR_APPEND) {
$this->saveEntityFinish($entityList);
}
}
return $this;
}
/**
* @param array $entityData
*
* @return $this
* @throws LocalizedException
*/
protected function saveEntityFinish(array $entityData)
{
if ($entityData) {
$entityIn = [];
echo "<pre>";
print_r($entityData);
echo "</pre>";
die;
foreach ($entityData as $entityRows) {
foreach ($entityRows as $row) {
$row        = array_map('trim', $row);
$entityIn[] = $row;
$rowData    = $row;
$keyarray   = array_keys($row);
$keyarray   = array_map('trim', $keyarray);                    
for( $i = 2; $i < COUNT($row); $i++ ){
$unit               = substr($keyarray[$i], 6);
$price              = $row[$keyarray[$i]];
$data['website_id'] = trim( $row['website_id'] );
$data['sku']        = trim( $row['sku'] );
$data['is_active']  = '1';
$data['unit_name']  = trim( $unit );
$data['unit_price'] = trim( $row[$keyarray[$i]] );
// Need to create option to insert product
}
}
}
}
return $this;
}
/**
* @param array $listCode
*
* @return bool
*/
protected function deleteEntityFinish(array $listCode)
{
if ($listCode) {
try {
$this->countItemsDeleted += $this->_connection->delete(
$this->getProductCatelog(),
$this->_connection->quoteInto('sku IN (?)', $listCode)
);
return true;
} catch (Exception $e) {
return false;
}
} else {
return false;
}
}
public function getProductCatelog()
{
// Logic to get product catalog data        
}
}

Not sure what I am doing wrong. Full code is is available on github. Any help would be appreciated.