Drupal\Core\Config\Schema\SchemaIncompleteException: Entity type 'Drupal\product_builder\Entity\ProductBuilderType' is missing 'config_export' definition

I get below error when I add product builder type /admin/structure/product_builder_type/add

I'm using PHP 7.4.33, Drupal 9.5.11 and Product Builder for Drupal Commerce 2.0.1-alpha1

The website encountered an unexpected error. Please try again later.

Drupal\Core\Config\Schema\SchemaIncompleteException: Entity type 'Drupal\product_builder\Entity\ProductBuilderType' is missing 'config_export' definition in its annotation in Drupal\Core\Config\Entity\ConfigEntityBase->toArray() (line 253 of core/lib/Drupal/Core/Config/Entity/ConfigEntityBase.php).
Drupal\Core\Config\Entity\ConfigEntityStorage->mapToStorageRecord() (Line: 273)
Drupal\Core\Config\Entity\ConfigEntityStorage->doSave() (Line: 520)
Drupal\Core\Entity\EntityStorageBase->save() (Line: 253)
Drupal\Core\Config\Entity\ConfigEntityStorage->save() (Line: 339)
Drupal\Core\Entity\EntityBase->save() (Line: 608)
Drupal\Core\Config\Entity\ConfigEntityBase->save() (Line: 48)
Drupal\product_builder\Form\ProductBuilderTypeForm->save()
call_user_func_array() (Line: 114)
Drupal\Core\Form\FormSubmitter->executeSubmitHandlers() (Line: 52)
Drupal\Core\Form\FormSubmitter->doSubmitForm() (Line: 597)
Drupal\Core\Form\FormBuilder->processForm() (Line: 325)
Drupal\Core\Form\FormBuilder->buildForm() (Line: 73)
Drupal\Core\Controller\FormController->getContentResult()
call_user_func_array() (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 580)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext() (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 169)
Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 81)
Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 58)
Drupal\Core\StackMiddleware\Session->handle() (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass() (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 50)
Drupal\ban\BanMiddleware->handle() (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 23)
Stack\StackedHttpKernel->handle() (Line: 718)
Drupal\Core\DrupalKernel->handle() (Line: 19)