Problem/Motivation
Once the field is required and we use type "Text area (multiple rows)" and enable wysiwyg there are following warnings/errors once the field is not populated :
Warning: Undefined array key "#parents" in Drupal\Core\Form\FormState->getError() (line 1159 of core/lib/Drupal/Core/Form/FormState.php).
Drupal\Core\Form\FormState->getError(Array) (Line: 166)
Drupal\Core\Form\FormErrorHandler->setElementErrorsFromFormState(Array, Object, Array) (Line: 126)
Drupal\Core\Form\FormErrorHandler->setElementErrorsFromFormState(Array, Object, Array) (Line: 126)
Drupal\Core\Form\FormErrorHandler->setElementErrorsFromFormState(Array, Object, Array) (Line: 126)
Drupal\Core\Form\FormErrorHandler->setElementErrorsFromFormState(Array, Object, Array) (Line: 126)
Drupal\Core\Form\FormErrorHandler->setElementErrorsFromFormState(Array, Object, Array) (Line: 126)
Drupal\Core\Form\FormErrorHandler->setElementErrorsFromFormState(Array, Object, Array) (Line: 126)
Drupal\Core\Form\FormErrorHandler->setElementErrorsFromFormState(Array, Object, Array) (Line: 126)
Drupal\Core\Form\FormErrorHandler->setElementErrorsFromFormState(Array, Object) (Line: 26)
Drupal\Core\Form\FormErrorHandler->handleFormErrors(Array, Object) (Line: 199)
Drupal\Core\Form\FormValidator->finalizeValidation(Array, Object, 'node_lessons_edit_form') (Line: 119)
Drupal\Core\Form\FormValidator->validateForm('node_lessons_edit_form', Array, Object) (Line: 593)
Drupal\Core\Form\FormBuilder->processForm('node_blockers_and_lessons_edit_form', Array, Object) (Line: 325)
Drupal\Core\Form\FormBuilder->buildForm(Object, Object) (Line: 73)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 627)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 181)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 28)
Drupal\Core\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 32)
Drupal\big_pipe\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 36)
Drupal\Core\StackMiddleware\AjaxPageState->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 704)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)
and
Warning: foreach() argument must be of type array|object, null given in Drupal\Core\Form\FormState->getError() (line 1159 of core/lib/Drupal/Core/Form/FormState.php).
Drupal\Core\Form\FormState->getError(Array) (Line: 166)
Drupal\Core\Form\FormErrorHandler->setElementErrorsFromFormState(Array, Object, Array) (Line: 126)
Drupal\Core\Form\FormErrorHandler->setElementErrorsFromFormState(Array, Object, Array) (Line: 126)
Drupal\Core\Form\FormErrorHandler->setElementErrorsFromFormState(Array, Object, Array) (Line: 126)
Drupal\Core\Form\FormErrorHandler->setElementErrorsFromFormState(Array, Object, Array) (Line: 126)
Drupal\Core\Form\FormErrorHandler->setElementErrorsFromFormState(Array, Object, Array) (Line: 126)
Drupal\Core\Form\FormErrorHandler->setElementErrorsFromFormState(Array, Object, Array) (Line: 126)
Drupal\Core\Form\FormErrorHandler->setElementErrorsFromFormState(Array, Object, Array) (Line: 126)
Drupal\Core\Form\FormErrorHandler->setElementErrorsFromFormState(Array, Object) (Line: 26)
Drupal\Core\Form\FormErrorHandler->handleFormErrors(Array, Object) (Line: 199)
Drupal\Core\Form\FormValidator->finalizeValidation(Array, Object, 'node_lessons_edit_form') (Line: 119)
Drupal\Core\Form\FormValidator->validateForm('node_lessons_edit_form', Array, Object) (Line: 593)
Drupal\Core\Form\FormBuilder->processForm('node_blockers_and_lessons_edit_form', Array, Object) (Line: 325)
Drupal\Core\Form\FormBuilder->buildForm(Object, Object) (Line: 73)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 627)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 181)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 28)
Drupal\Core\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 32)
Drupal\big_pipe\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 36)
Drupal\Core\StackMiddleware\AjaxPageState->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 704)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)
<code>
once the <code>wysiwyg
is disabled, there is no issue.
In my case I have selected "basic html"