InvalidArgumentException: Field default_langcode is unknown.

Downgrading to Drupal 10.2.4 and using webform 6.2.1 or 6.2.2 seems to have fixed this in development. There seems to be an introduction of requiring a default_langcode in core that causes an issue with webform.

Even after installing Configuration Translation and related modules in Drupal 10.2.5 or 10.2.6, no webforms are accessible.

Production has both drupal 10.2.4 and webfrom 6.2.2 but still broken with "invalidArgumentException: Field default_langcode is unknown"

The only difference is in development we restored a database from when it was 10.2.4 and it's working but we can't do that on production.

Are any patches installed? Can you please get the stack trace? Can you search the code base for “default_langcode” and report back?

Howdy,

Even after installing Configuration Translation and related modules in Drupal 10.2.5 or 10.2.6, no webforms are accessible. There was no issue with webform configuration, just when viewing the form equals wsod.

Running Webform 6.2.2 on recently update Drupal core 10.2.5 here, and webforms are working OK.

This is a Japanese site, with more than 7 very different webforms, and none of them show the problem reported here.

Reporting this FWIW.

#4 will do today, just starting, thank you #4 and 5.

Replicated production on a clean dev. They are currently on D10.2.4 and webform 6.2.2. Installed Configuration Translation, Interface Translation, Language and Locale. Visit webform/configuration/translate

Warning message
In order to translate configuration, the website must have at least two languages.

Added a 2nd language

Visit webform/configuration/translate and seems fine

Visit webform/configuration/advanced and repair configuration

Flush cache

Visit a form, same error

"default_langcode" locations

webform.install.inc
\modules\contrib\webform\includes

content_translation.admin.inc
\core\modules\content_translation

install.core.inc
\core\includes

install.inc
\core\includes

update.fetch.inc
\core\modules\update

#0 C:\xampp\htdocs\web\core\lib\Drupal\Core\Entity\ContentEntityBase.php(597): Drupal\Core\Entity\ContentEntityBase->getTranslatedField('default_langcod...', 'x-default')
#1 C:\xampp\htdocs\web\modules\contrib\multiple_select\multiple_select.module(51): Drupal\Core\Entity\ContentEntityBase->get('default_langcod...')
#2 C:\xampp\htdocs\web\modules\contrib\multiple_select\multiple_select.module(36): multiple_select(Array, Object(Drupal\Core\Form\FormState), 'webform_submiss...')
#3 C:\xampp\htdocs\web\core\lib\Drupal\Core\Extension\ModuleHandler.php(545): multiple_select_form_alter(Array, Object(Drupal\Core\Form\FormState), 'webform_submiss...')
#4 C:\xampp\htdocs\web\core\lib\Drupal\Core\Form\FormBuilder.php(841): Drupal\Core\Extension\ModuleHandler->alter('form', Array, Object(Drupal\Core\Form\FormState), 'webform_submiss...')
#5 C:\xampp\htdocs\web\core\lib\Drupal\Core\Form\FormBuilder.php(284): Drupal\Core\Form\FormBuilder->prepareForm('webform_submiss...', Array, Object(Drupal\Core\Form\FormState))
#6 C:\xampp\htdocs\web\core\lib\Drupal\Core\Entity\EntityFormBuilder.php(48): Drupal\Core\Form\FormBuilder->buildForm(Object(Drupal\webform\WebformSubmissionForm), Object(Drupal\Core\Form\FormState))
#7 C:\xampp\htdocs\web\modules\contrib\webform\src\Entity\Webform.php(1257): Drupal\Core\Entity\EntityFormBuilder->getForm(Object(Drupal\webform\Entity\WebformSubmission), 'add')
#8 C:\xampp\htdocs\web\modules\contrib\webform\src\Controller\WebformEntityController.php(77): Drupal\webform\Entity\Webform->getSubmissionForm()
#9 [internal function]: Drupal\webform\Controller\WebformEntityController->addForm(Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\webform\Entity\Webform))
#10 C:\xampp\htdocs\web\core\lib\Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array)
#11 C:\xampp\htdocs\web\core\lib\Drupal\Core\Render\Renderer.php(627): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#12 C:\xampp\htdocs\web\core\lib\Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure))
#13 C:\xampp\htdocs\web\core\lib\Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array)
#14 C:\xampp\htdocs\vendor\symfony\http-kernel\HttpKernel.php(181): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#15 C:\xampp\htdocs\vendor\symfony\http-kernel\HttpKernel.php(76): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1)
#16 C:\xampp\htdocs\web\core\lib\Drupal\Core\StackMiddleware\Session.php(58): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#17 C:\xampp\htdocs\web\core\lib\Drupal\Core\StackMiddleware\KernelPreHandle.php(48): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#18 C:\xampp\htdocs\web\core\lib\Drupal\Core\StackMiddleware\ContentLength.php(28): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#19 C:\xampp\htdocs\web\core\modules\page_cache\src\StackMiddleware\PageCache.php(106): Drupal\Core\StackMiddleware\ContentLength->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#20 C:\xampp\htdocs\web\core\modules\page_cache\src\StackMiddleware\PageCache.php(85): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#21 C:\xampp\htdocs\web\core\modules\ban\src\BanMiddleware.php(50): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#22 C:\xampp\htdocs\web\core\lib\Drupal\Core\StackMiddleware\ReverseProxyMiddleware.php(48): Drupal\ban\BanMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#23 C:\xampp\htdocs\web\core\lib\Drupal\Core\StackMiddleware\NegotiationMiddleware.php(51): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#24 C:\xampp\htdocs\web\core\lib\Drupal\Core\StackMiddleware\AjaxPageState.php(36): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#25 C:\xampp\htdocs\web\core\lib\Drupal\Core\StackMiddleware\StackedHttpKernel.php(51): Drupal\Core\StackMiddleware\AjaxPageState->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#26 C:\xampp\htdocs\web\core\lib\Drupal\Core\DrupalKernel.php(704): Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#27 C:\xampp\htdocs\web\index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request))
#28 {main}

Ah, I think I see in the backtrace, multiple_select module is involved and it was recently added and also needed a patch.

"drupal/multiple_select": {
"Compatibility with module Field Group 8.x-3.4": " https://www.drupal.org/files/issues/2023-06-26/multiple_select-compatibi... → "
},

This is the issue. After uninstalling that module, webform is back to normal. Sorry for the trouble here, will close and post reference to here at multiple_select.

Thank you