The "default" form handler of the "oauth_client_request_type" entity type

Problem/Motivation

Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException: The "default" form handler of the "oauth_client_request_type" entity type specifies a non-existent class "Drupal\oauth_client\Form\OauthClientTypeForm". in Drupal\Core\Entity\EntityTypeManager->getFormObject() (line 214 of core/lib/Drupal/Core/Entity/EntityTypeManager.php).

Drupal\Core\Entity\HtmlEntityFormController->getFormObject() (Line: 58)
Drupal\Core\Controller\FormController->getContentResult() (Line: 39)
Drupal\layout_builder\Controller\LayoutBuilderHtmlEntityFormController->getContentResult()
call_user_func_array() (Line: 123)