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I have written a module that creates a custom Content Entity that has a number of fields including an entity_reference field with a "file" target type. The field_ui module adds location task tabs, alongside my entity settings page, for editing field properties (good!). However, clicking on the field_ui "Manage display" tab for my custom Entity settings crashes Drupal (and not in my code). Has anyone else seen this problem? What "file" plugin is it referring to? This happens in multiple versions of Drupal (8.0.6, 8.1.1, 8.1.7):

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

Drupal\Component\Plugin\Exception\PluginNotFoundException: The "file" plugin does not exist. in Drupal\Core\Plugin\DefaultPluginManager->doGetDefinition() (line 57 of core/lib/Drupal/Component/Plugin/Discovery/DiscoveryTrait.php). Drupal\Core\Plugin\DefaultPluginManager->getDefinition('file') Drupal\Core\Field\FormatterPluginManager->createInstance('file', Array) Drupal\Core\Plugin\DefaultLazyPluginCollection->initializePlugin('file') Drupal\Component\Plugin\LazyPluginCollection->get('file') Drupal\Component\Plugin\LazyPluginCollection->getIterator() Drupal\Core\Plugin\DefaultLazyPluginCollection->getConfiguration() Drupal\Core\Config\Entity\ConfigEntityBase->preSave(Object, 1) Drupal\Core\Entity\EntityDisplayBase->preSave(Object) Drupal\Core\Entity\EntityStorageBase->doPreSave(Object) Drupal\Core\Entity\EntityStorageBase->save(Object) Drupal\Core\Config\Entity\ConfigEntityStorage->save(Object) Drupal\Core\Entity\Entity->save() Drupal\Core\Config\Entity\ConfigEntityBase->save() Drupal\field_ui\Form\EntityDisplayFormBase->buildFieldRow(Object, Array, Object) Drupal\field_ui\Form\EntityViewDisplayEditForm->buildFieldRow(Object, Array, Object) Drupal\field_ui\Form\EntityDisplayFormBase->form(Array, Object) Drupal\Core\Entity\EntityForm->buildForm(Array, Object) call_user_func_array(Array, Array) Drupal\Core\Form\FormBuilder->retrieveForm('entity_view_display_edit_form', Object) Drupal\Core\Form\FormBuilder->buildForm(Object, Object) Drupal\Core\Controller\FormController->getContentResult(Object, Object) call_user_func_array(Array, Array) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber{closure}() Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber{closure}() call_user_func_array(Object, Array) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) Stack\StackedHttpKernel->handle(Object, 1, 1) Drupal\Core\DrupalKernel->handle(Object)

I have written a module that creates a custom Content Entity that has a number of fields including an entity_reference field with a "file" target type. The field_ui module adds location task tabs, alongside my entity settings page, for editing field properties (good!). However, clicking on the field_ui "Manage display" tab for my custom Entity settings crashes Drupal (and not in my code). Has anyone else seen this problem? What "file" plugin is it referring to?:

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

Drupal\Component\Plugin\Exception\PluginNotFoundException: The "file" plugin does not exist. in Drupal\Core\Plugin\DefaultPluginManager->doGetDefinition() (line 57 of core/lib/Drupal/Component/Plugin/Discovery/DiscoveryTrait.php). Drupal\Core\Plugin\DefaultPluginManager->getDefinition('file') Drupal\Core\Field\FormatterPluginManager->createInstance('file', Array) Drupal\Core\Plugin\DefaultLazyPluginCollection->initializePlugin('file') Drupal\Component\Plugin\LazyPluginCollection->get('file') Drupal\Component\Plugin\LazyPluginCollection->getIterator() Drupal\Core\Plugin\DefaultLazyPluginCollection->getConfiguration() Drupal\Core\Config\Entity\ConfigEntityBase->preSave(Object, 1) Drupal\Core\Entity\EntityDisplayBase->preSave(Object) Drupal\Core\Entity\EntityStorageBase->doPreSave(Object) Drupal\Core\Entity\EntityStorageBase->save(Object) Drupal\Core\Config\Entity\ConfigEntityStorage->save(Object) Drupal\Core\Entity\Entity->save() Drupal\Core\Config\Entity\ConfigEntityBase->save() Drupal\field_ui\Form\EntityDisplayFormBase->buildFieldRow(Object, Array, Object) Drupal\field_ui\Form\EntityViewDisplayEditForm->buildFieldRow(Object, Array, Object) Drupal\field_ui\Form\EntityDisplayFormBase->form(Array, Object) Drupal\Core\Entity\EntityForm->buildForm(Array, Object) call_user_func_array(Array, Array) Drupal\Core\Form\FormBuilder->retrieveForm('entity_view_display_edit_form', Object) Drupal\Core\Form\FormBuilder->buildForm(Object, Object) Drupal\Core\Controller\FormController->getContentResult(Object, Object) call_user_func_array(Array, Array) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber{closure}() Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber{closure}() call_user_func_array(Object, Array) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) Stack\StackedHttpKernel->handle(Object, 1, 1) Drupal\Core\DrupalKernel->handle(Object)

I have written a module that creates a custom Content Entity that has a number of fields including an entity_reference field with a "file" target type. The field_ui module adds location task tabs, alongside my entity settings page, for editing field properties (good!). However, clicking on the field_ui "Manage display" tab for my custom Entity settings crashes Drupal (and not in my code). Has anyone else seen this problem? What "file" plugin is it referring to? This happens in multiple versions of Drupal (8.0.6, 8.1.1, 8.1.7):

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

Drupal\Component\Plugin\Exception\PluginNotFoundException: The "file" plugin does not exist. in Drupal\Core\Plugin\DefaultPluginManager->doGetDefinition() (line 57 of core/lib/Drupal/Component/Plugin/Discovery/DiscoveryTrait.php). Drupal\Core\Plugin\DefaultPluginManager->getDefinition('file') Drupal\Core\Field\FormatterPluginManager->createInstance('file', Array) Drupal\Core\Plugin\DefaultLazyPluginCollection->initializePlugin('file') Drupal\Component\Plugin\LazyPluginCollection->get('file') Drupal\Component\Plugin\LazyPluginCollection->getIterator() Drupal\Core\Plugin\DefaultLazyPluginCollection->getConfiguration() Drupal\Core\Config\Entity\ConfigEntityBase->preSave(Object, 1) Drupal\Core\Entity\EntityDisplayBase->preSave(Object) Drupal\Core\Entity\EntityStorageBase->doPreSave(Object) Drupal\Core\Entity\EntityStorageBase->save(Object) Drupal\Core\Config\Entity\ConfigEntityStorage->save(Object) Drupal\Core\Entity\Entity->save() Drupal\Core\Config\Entity\ConfigEntityBase->save() Drupal\field_ui\Form\EntityDisplayFormBase->buildFieldRow(Object, Array, Object) Drupal\field_ui\Form\EntityViewDisplayEditForm->buildFieldRow(Object, Array, Object) Drupal\field_ui\Form\EntityDisplayFormBase->form(Array, Object) Drupal\Core\Entity\EntityForm->buildForm(Array, Object) call_user_func_array(Array, Array) Drupal\Core\Form\FormBuilder->retrieveForm('entity_view_display_edit_form', Object) Drupal\Core\Form\FormBuilder->buildForm(Object, Object) Drupal\Core\Controller\FormController->getContentResult(Object, Object) call_user_func_array(Array, Array) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber{closure}() Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber{closure}() call_user_func_array(Object, Array) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) Stack\StackedHttpKernel->handle(Object, 1, 1) Drupal\Core\DrupalKernel->handle(Object)

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How to enable field_ui "Manage display" for a custom entity?

I have written a module that creates a custom Content Entity that has a number of fields including an entity_reference field with a "file" target type. The field_ui module adds location task tabs, alongside my entity settings page, for editing field properties (good!). However, clicking on the field_ui "Manage display" tab for my custom Entity settings crashes Drupal (and not in my code). Has anyone else seen this problem? What "file" plugin is it referring to?:

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

Drupal\Component\Plugin\Exception\PluginNotFoundException: The "file" plugin does not exist. in Drupal\Core\Plugin\DefaultPluginManager->doGetDefinition() (line 57 of core/lib/Drupal/Component/Plugin/Discovery/DiscoveryTrait.php). Drupal\Core\Plugin\DefaultPluginManager->getDefinition('file') Drupal\Core\Field\FormatterPluginManager->createInstance('file', Array) Drupal\Core\Plugin\DefaultLazyPluginCollection->initializePlugin('file') Drupal\Component\Plugin\LazyPluginCollection->get('file') Drupal\Component\Plugin\LazyPluginCollection->getIterator() Drupal\Core\Plugin\DefaultLazyPluginCollection->getConfiguration() Drupal\Core\Config\Entity\ConfigEntityBase->preSave(Object, 1) Drupal\Core\Entity\EntityDisplayBase->preSave(Object) Drupal\Core\Entity\EntityStorageBase->doPreSave(Object) Drupal\Core\Entity\EntityStorageBase->save(Object) Drupal\Core\Config\Entity\ConfigEntityStorage->save(Object) Drupal\Core\Entity\Entity->save() Drupal\Core\Config\Entity\ConfigEntityBase->save() Drupal\field_ui\Form\EntityDisplayFormBase->buildFieldRow(Object, Array, Object) Drupal\field_ui\Form\EntityViewDisplayEditForm->buildFieldRow(Object, Array, Object) Drupal\field_ui\Form\EntityDisplayFormBase->form(Array, Object) Drupal\Core\Entity\EntityForm->buildForm(Array, Object) call_user_func_array(Array, Array) Drupal\Core\Form\FormBuilder->retrieveForm('entity_view_display_edit_form', Object) Drupal\Core\Form\FormBuilder->buildForm(Object, Object) Drupal\Core\Controller\FormController->getContentResult(Object, Object) call_user_func_array(Array, Array) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber{closure}() Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber{closure}() call_user_func_array(Object, Array) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) Stack\StackedHttpKernel->handle(Object, 1, 1) Drupal\Core\DrupalKernel->handle(Object)