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Error: Call to a member function getName() on null in Drupal\lang_dropdown\Form\LanguageDropdownForm->buildForm() (line 229 of modules/contrib/lang_dropdown/src/Form/LanguageDropdownForm.php).
Drupal\lang_dropdown\Form\LanguageDropdownForm->buildForm() call_user_func_array() (Line: 536) Drupal\Core\Form\FormBuilder->retrieveForm() (Line: 283) Drupal\Core\Form\FormBuilder->buildForm() (Line: 97) Drupal\autosave_form\Form\AutosaveFormBuilder->buildForm() (Line: 224) Drupal\Core\Form\FormBuilder->getForm() (Line: 762) Drupal\lang_dropdown\Plugin\Block\LanguageDropdownBlock->build() (Line: 33) Drupal\jango_shortcodes\Plugin\Shortcode\BlockShortcode->process() (Line: 438) Drupal\shortcode\ShortcodeService->processTag() (Line: 315) Drupal\shortcode\ShortcodeService->process() (Line: 78) Drupal\shortcode\Plugin\Filter\Shortcode->process() (Line: 118) Drupal\filter\Element\ProcessedText::preRenderText() call_user_func_array() (Line: 101) Drupal\Core\Render\Renderer->doTrustedCallback() (Line: 813) Drupal\Core\Render\Renderer->doCallback() (Line: 382) Drupal\Core\Render\Renderer->doRender() (Line: 211) Drupal\Core\Render\Renderer->render() (Line: 479) Drupal\Core\Template\TwigExtension->escapeFilter() (Line: 87) __TwigTemplate_e818e6387b55ceb50a51eca8b8fde613->doDisplay() (Line: 405) Twig\Template->displayWithErrorHandling() (Line: 378) Twig\Template->display() (Line: 390) Twig\Template->render() (Line: 55) twig_render_template() (Line: 384) Drupal\Core\Theme\ThemeManager->render() (Line: 457) Drupal\Core\Render\Renderer->doRender() (Line: 470) Drupal\Core\Render\Renderer->doRender() (Line: 211) Drupal\Core\Render\Renderer->render() (Line: 479) Drupal\Core\Template\TwigExtension->escapeFilter() (Line: 85) __TwigTemplate_126d19d74364913f0256e48f1a197060->block_content() (Line: 182) Twig\Template->displayBlock() (Line: 67) __TwigTemplate_126d19d74364913f0256e48f1a197060->doDisplay() (Line: 405) Twig\Template->displayWithErrorHandling() (Line: 378) Twig\Template->display() (Line: 390) Twig\Template->render() (Line: 55) twig_render_template() (Line: 384) Drupal\Core\Theme\ThemeManager->render() (Line: 457) Drupal\Core\Render\Renderer->doRender() (Line: 211) Drupal\Core\Render\Renderer->render() (Line: 167) Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 605) Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 168) Drupal\Core\Render\Renderer->renderPlain() (Line: 182) Drupal\Core\Render\Renderer->renderPlaceholder() (Line: 690) Drupal\Core\Render\Renderer->replacePlaceholders() (Line: 574) Drupal\Core\Render\Renderer->doRender() (Line: 211) Drupal\Core\Render\Renderer->render() (Line: 155) Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 605) Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 156) Drupal\Core\Render\Renderer->renderRoot() (Line: 278) Drupal\Core\Render\HtmlResponseAttachmentsProcessor->renderPlaceholders() (Line: 127) Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAttachments() (Line: 45) Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond() call_user_func() (Line: 142) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 202) Symfony\Component\HttpKernel\HttpKernel->filterResponse() (Line: 190) Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 81) Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 58) Drupal\Core\StackMiddleware\Session->handle() (Line: 48) Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 50) Drupal\ban\BanMiddleware->handle() (Line: 48) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 23) Stack\StackedHttpKernel->handle() (Line: 166) Drupal\Core\EventSubscriber\DefaultExceptionHtmlSubscriber->makeSubrequest() (Line: 119) Drupal\Core\EventSubscriber\CustomPageExceptionHtmlSubscriber->makeSubrequestToCustomPath() (Line: 71) Drupal\Core\EventSubscriber\CustomPageExceptionHtmlSubscriber->on403() (Line: 109) Drupal\Core\EventSubscriber\HttpExceptionSubscriberBase->onException() call_user_func() (Line: 142) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 229) Symfony\Component\HttpKernel\HttpKernel->handleThrowable() (Line: 92) Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 58) Drupal\Core\StackMiddleware\Session->handle() (Line: 48) Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 50) Drupal\ban\BanMiddleware->handle() (Line: 48) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 23) Stack\StackedHttpKernel->handle() (Line: 718) Drupal\Core\DrupalKernel->handle() (Line: 19)