Found this error does not extend \Magento\Framework\DataObject

You did not define Model, Resource Model, Collection class properly. You have to define properly as below:

Model Class: app/code/Sugarcode/Test/Model/Fee.php

<?php
/**
 * User: Amit Bera
 * Email: [email protected]
 */

namespace Sugarcode\Test\Model;


class Fee extends  \Magento\Framework\Model\AbstractModel
{
    public function _construct()
    {
        $this->_init(\Sugarcode\Test\Model\ResourceModel\Fee::class);
    }

}

Resource Model Class: app/code/Sugarcode/Test/Model/ResourceModel/Fee.php

<?php
/**
 * User: Amit Bera
 * Email: [email protected]
 */

namespace Sugarcode\Test\Model\ResourceModel;


class Fee extends \Magento\Framework\Model\ResourceModel\Db\AbstractDb
{

    /**
     * Resource initialization
     *
     * @return void
     */
    protected function _construct()
    {
        $this->_init('mr_dukaaniatest', 'dukaaniatest_id');
    }
}

Collection Class: app/code/Sugarcode/Test/Model/ResourceModel/Fee/Collection.php

<?php
/**
 * User: Amit Bera
 * Email: [email protected]
 */

namespace Sugarcode\Test\Model\ResourceModel\Fee;


class Collection extends \Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection
{
    public function _construct()
    {
        $this->_init(
            \Sugarcode\Test\Model\Fee::class,
            \Sugarcode\Test\Model\ResourceModel\Fee::class
        );
    }

}

I was facing the same issue On version 2.2.3 where is 2.2.2 work absolutely fine not sure but something change in 2.2.3 that the bellow does not accepts the use:

...

use \Vendor\Module\Model\Entity;
use \Vendor\Module\Model\ResourceModel\Entity as EntityResourceModel;

...

$this->_init(Entity::class,EntityResourceModel::class);

...

2.2.3 version changing to :

$this->_init(
        \Vendor\Module\Model\Entity::class,
        \Vendor\Module\Model\ResourceModel\Entity::class
        );

Works!