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Error: Call to a member function get() on null in Drupal\ex81\Controller\MuseoController->get_opere_areaespositiva2() (line 799 of modules/custom/form-module/src/Controller/MuseoController.php).
Drupal\ex81\Controller\MuseoController->get_opere_areaespositiva2() (Line: 79) __TwigTemplate_64431e89f1451b9de35889d3a0c2556e0b386ccb5e79f982be39c09d4c5be524->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: 433) Drupal\Core\Render\Renderer->doRender() (Line: 204) Drupal\Core\Render\Renderer->render() (Line: 242) Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 580) Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 243) Drupal\Core\Render\MainContent\HtmlRenderer->prepare() (Line: 132) Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse() (Line: 90) Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray() call_user_func() (Line: 142) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 174) 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: 191) Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 128) Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 82) Drupal\page_cache\StackMiddleware\PageCache->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: 713) Drupal\Core\DrupalKernel->handle() (Line: 19)