Code used for field creation
$fields['duration'] = BaseFieldDefinition::create('duration')
->setLabel(t('Duration'))
->setDescription(t('Length of the video.'))
->setSetting('granularity', [
'year' => FALSE,
'month'=> FALSE,
'day' => FALSE,
'hour' => FALSE,
'minute' => TRUE,
'second' => TRUE,
])
->setDisplayOptions('form', [
'type' => 'duration',
])
->setDisplayConfigurable('form', TRUE)
->setDisplayConfigurable('view', TRUE);
Error after saving the entity.
Error: Cannot unset string offsets in Drupal\Core\Field\WidgetBase->extractFormValues() (line 367 of /var/www/html/web/core/lib/Drupal/Core/Field/WidgetBase.php) #0 /var/www/html/web/core/lib/Drupal/Core/Entity/Entity/EntityFormDisplay.php(225): Drupal\Core\Field\WidgetBase->extractFormValues(Object(Drupal\Core\Field\FieldItemList), Array, Object(Drupal\Core\Form\FormState)) #1 /var/www/html/web/core/lib/Drupal/Core/Entity/ContentEntityForm.php(335): Drupal\Core\Entity\Entity\EntityFormDisplay->extractFormValues(Object(Drupal\ed_academy\Entity\Module), Array, Object(Drupal\Core\Form\FormState)) #2 /var/www/html/web/core/lib/Drupal/Core/Entity/EntityForm.php(293): Drupal\Core\Entity\ContentEntityForm->copyFormValuesToEntity(Object(Drupal\ed_academy\Entity\Module), Array, Object(Drupal\Core\Form\FormState)) #3 /var/www/html/web/core/lib/Drupal/Core/Entity/ContentEntityForm.php(156): Drupal\Core\Entity\EntityForm->buildEntity(Array, Object(Drupal\Core\Form\FormState)) #4 /var/www/html/web/core/lib/Drupal/Core/Entity/ContentEntityForm.php(187): Drupal\Core\Entity\ContentEntityForm->buildEntity(Array, Object(Drupal\Core\Form\FormState)) #5 [internal function]: Drupal\Core\Entity\ContentEntityForm->validateForm(Array, Object(Drupal\Core\Form\FormState)) #6 /var/www/html/web/core/lib/Drupal/Core/Form/FormValidator.php(83): call_user_func_array(Array, Array) #7 /var/www/html/web/core/lib/Drupal/Core/Form/FormValidator.php(276): Drupal\Core\Form\FormValidator->executeValidateHandlers(Array, Object(Drupal\Core\Form\FormState)) #8 /var/www/html/web/core/lib/Drupal/Core/Form/FormValidator.php(119): Drupal\Core\Form\FormValidator->doValidateForm(Array, Object(Drupal\Core\Form\FormState), 'module_edit_for...') #9 /var/www/html/web/core/lib/Drupal/Core/Form/FormBuilder.php(571): Drupal\Core\Form\FormValidator->validateForm('module_edit_for...', Array, Object(Drupal\Core\Form\FormState)) #10 /var/www/html/web/core/lib/Drupal/Core/Form/FormBuilder.php(314): Drupal\Core\Form\FormBuilder->processForm('module_edit_for...', Array, Object(Drupal\Core\Form\FormState)) #11 /var/www/html/web/core/lib/Drupal/Core/Controller/FormController.php(74): Drupal\Core\Form\FormBuilder->buildForm('module_edit_for...', Object(Drupal\Core\Form\FormState)) #12 [internal function]: Drupal\Core\Controller\FormController->getContentResult(Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Routing\RouteMatch)) #13 /var/www/html/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array) #14 /var/www/html/web/core/lib/Drupal/Core/Render/Renderer.php(582): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #15 /var/www/html/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure)) #16 /var/www/html/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) #17 /var/www/html/vendor/symfony/http-kernel/HttpKernel.php(151): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #18 /var/www/html/vendor/symfony/http-kernel/HttpKernel.php(68): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #19 /var/www/html/web/core/lib/Drupal/Core/StackMiddleware/Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #20 /var/www/html/web/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #21 /var/www/html/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(99): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #22 /var/www/html/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(78): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true) #23 /var/www/html/web/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #24 /var/www/html/web/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(50): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #25 /var/www/html/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #26 /var/www/html/web/core/lib/Drupal/Core/DrupalKernel.php(664): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #27 /var/www/html/web/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #28 {main}.