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InvalidArgumentException: The URI 'www.gof-summerschool.org' is invalid. You must use a valid URI scheme. in Drupal\Core\Url::fromUri() (line 293 of core/lib/Drupal/Core/Url.php).
Drupal\link\Plugin\Field\FieldType\LinkItem->getUrl() (Line: 240)
Drupal\link\Plugin\Field\FieldFormatter\LinkFormatter->buildUrl() (Line: 178)
Drupal\link\Plugin\Field\FieldFormatter\LinkFormatter->viewElements() (Line: 89)
Drupal\Core\Field\FormatterBase->view() (Line: 263)
Drupal\Core\Entity\Entity\EntityViewDisplay->buildMultiple() (Line: 266)
Drupal\layout_builder\Entity\LayoutBuilderEntityViewDisplay->buildMultiple() (Line: 340)
Drupal\Core\Entity\EntityViewBuilder->buildComponents() (Line: 24)
Drupal\node\NodeViewBuilder->buildComponents() (Line: 282)
Drupal\Core\Entity\EntityViewBuilder->buildMultiple() (Line: 239)
Drupal\Core\Entity\EntityViewBuilder->build()
call_user_func_array() (Line: 101)
Drupal\Core\Render\Renderer->doTrustedCallback() (Line: 772)
Drupal\Core\Render\Renderer->doCallback() (Line: 363)
Drupal\Core\Render\Renderer->doRender() (Line: 201)
Drupal\Core\Render\Renderer->render() (Line: 241)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 564)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 242)
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: 163)
Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 80)
Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 67)
Drupal\simple_oauth\HttpMiddleware\BasicAuthSwap->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: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 23)
Stack\StackedHttpKernel->handle() (Line: 709)
Drupal\Core\DrupalKernel->handle() (Line: 19)