Error: Class "Espo\Core\Api\Record" not found

[Vistouso]

I am getting error message when I tried to upgrade EspoCRM from 8.4.2 to 9. Can any one help?

$ php command.php upgrade
Current version is 8.4.2.
EspoCRM will be upgraded to version 9.0.0 now. Enter [Y] to continue.
Y
This may take a while. Do not close the terminal.
Downloading...
Upgrading...
Initialization...
Copying before upgrade files...
Rebuilding...
Before upgrade script execution...
Reverting...
Error: Class "Espo\Core\Api\Record" not found

[Vistouso]

After doing some research, the error is generated from the following: class CApplicationForm extends \Espo\Core\Api\Record


/custom/Espo/Custom/Api/CApplicationForm.php

<?php

namespace Espo\Custom\Api;

use Espo\Modules\Crm\Services\Record;

class CApplicationForm extends \Espo\Core\Api\Record