Error message

• Deprecated function: parse_url(): Passing null to parameter #1 ($url) of type string is deprecated in Drupal\feeds\Plugin\Field\FieldFormatter\FeedsItemFormatterBase->valueIsUrl() (line 23 of modules/contrib/feeds/src/Plugin/Field/FieldFormatter/FeedsItemFormatterBase.php).

  Drupal\feeds\Plugin\Field\FieldFormatter\FeedsItemFormatterBase->valueIsUrl(NULL) (Line: 28)
  Drupal\feeds\Plugin\Field\FieldFormatter\FeedsItemGuidFormatter->viewElements(Object, 'pt-pt') (Line: 89)
  Drupal\Core\Field\FormatterBase->view(Object, 'pt-pt') (Line: 76)
  Drupal\Core\Field\Plugin\Field\FieldFormatter\EntityReferenceFormatterBase->view(Object, 'pt-pt') (Line: 268)
  Drupal\Core\Entity\Entity\EntityViewDisplay->buildMultiple(Array) (Line: 269)
  Drupal\layout_builder\Entity\LayoutBuilderEntityViewDisplay->buildMultiple(Array) (Line: 339)
  Drupal\Core\Entity\EntityViewBuilder->buildComponents(Array, Array, Array, 'rss') (Line: 24)
  Drupal\node\NodeViewBuilder->buildComponents(Array, Array, Array, 'rss') (Line: 281)
  Drupal\Core\Entity\EntityViewBuilder->buildMultiple(Array) (Line: 238)
  Drupal\Core\Entity\EntityViewBuilder->build(Array)
  call_user_func_array(Array, Array) (Line: 111)
  Drupal\Core\Render\Renderer->doTrustedCallback(Array, Array, 'Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. See https://www.drupal.org/node/2966725', 'exception', 'Drupal\Core\Render\Element\RenderCallbackInterface') (Line: 858)
  Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array) (Line: 421)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240)
  Drupal\Core\Render\Renderer->render(Array) (Line: 952)
  template_preprocess_views_view_row_rss(Array, 'views_view_row_rss', Array)
  call_user_func_array('template_preprocess_views_view_row_rss', Array) (Line: 261)
  Drupal\Core\Theme\ThemeManager->render('views_view_row_rss', Array) (Line: 480)
  Drupal\Core\Render\Renderer->doRender(Array) (Line: 493)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240)
  Drupal\Core\Render\Renderer->render(Array) (Line: 475)
  Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 69)
  __TwigTemplate_0aa15d5d10f040db1b70275c59cb16cd->doDisplay(Array, Array) (Line: 394)
  Twig\Template->displayWithErrorHandling(Array, Array) (Line: 367)
  Twig\Template->display(Array) (Line: 379)
  Twig\Template->render(Array) (Line: 38)
  Twig\TemplateWrapper->render(Array) (Line: 39)
  twig_render_template('core/themes/stable9/templates/views/views-view-rss.html.twig', Array) (Line: 348)
  Drupal\Core\Theme\ThemeManager->render('views_view_rss', Array) (Line: 480)
  Drupal\Core\Render\Renderer->doRender(Array) (Line: 493)
  Drupal\Core\Render\Renderer->doRender(Array, 1) (Line: 240)
  Drupal\Core\Render\Renderer->render(Array, 1) (Line: 153)
  Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 627)
  Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 152)
  Drupal\Core\Render\Renderer->renderRoot(Array) (Line: 109)
  Drupal\views\Plugin\views\display\Feed::buildResponse('taxonomy_term', 'feed_1', Array) (Line: 56)
  Drupal\views\Routing\ViewPageController->handle('taxonomy_term', 'feed_1', Object)
  call_user_func_array(Array, Array) (Line: 123)
  Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 627)
  Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 121)
  Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
  Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 181)
  Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 76)
  Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
  Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
  Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 28)
  Drupal\Core\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 191)
  Drupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 128)
  Drupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 82)
  Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
  Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
  Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 36)
  Drupal\Core\StackMiddleware\AjaxPageState->handle(Object, 1, 1) (Line: 51)
  Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 704)
  Drupal\Core\DrupalKernel->handle(Object) (Line: 19)
  

• Deprecated function: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\feeds\Plugin\Field\FieldFormatter\FeedsItemGuidFormatter->viewElements() (line 38 of modules/contrib/feeds/src/Plugin/Field/FieldFormatter/FeedsItemGuidFormatter.php).

  Drupal\feeds\Plugin\Field\FieldFormatter\FeedsItemGuidFormatter->viewElements(Object, 'pt-pt') (Line: 89)
  Drupal\Core\Field\FormatterBase->view(Object, 'pt-pt') (Line: 76)
  Drupal\Core\Field\Plugin\Field\FieldFormatter\EntityReferenceFormatterBase->view(Object, 'pt-pt') (Line: 268)
  Drupal\Core\Entity\Entity\EntityViewDisplay->buildMultiple(Array) (Line: 269)
  Drupal\layout_builder\Entity\LayoutBuilderEntityViewDisplay->buildMultiple(Array) (Line: 339)
  Drupal\Core\Entity\EntityViewBuilder->buildComponents(Array, Array, Array, 'rss') (Line: 24)
  Drupal\node\NodeViewBuilder->buildComponents(Array, Array, Array, 'rss') (Line: 281)
  Drupal\Core\Entity\EntityViewBuilder->buildMultiple(Array) (Line: 238)
  Drupal\Core\Entity\EntityViewBuilder->build(Array)
  call_user_func_array(Array, Array) (Line: 111)
  Drupal\Core\Render\Renderer->doTrustedCallback(Array, Array, 'Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. See https://www.drupal.org/node/2966725', 'exception', 'Drupal\Core\Render\Element\RenderCallbackInterface') (Line: 858)
  Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array) (Line: 421)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240)
  Drupal\Core\Render\Renderer->render(Array) (Line: 952)
  template_preprocess_views_view_row_rss(Array, 'views_view_row_rss', Array)
  call_user_func_array('template_preprocess_views_view_row_rss', Array) (Line: 261)
  Drupal\Core\Theme\ThemeManager->render('views_view_row_rss', Array) (Line: 480)
  Drupal\Core\Render\Renderer->doRender(Array) (Line: 493)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240)
  Drupal\Core\Render\Renderer->render(Array) (Line: 475)
  Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 69)
  __TwigTemplate_0aa15d5d10f040db1b70275c59cb16cd->doDisplay(Array, Array) (Line: 394)
  Twig\Template->displayWithErrorHandling(Array, Array) (Line: 367)
  Twig\Template->display(Array) (Line: 379)
  Twig\Template->render(Array) (Line: 38)
  Twig\TemplateWrapper->render(Array) (Line: 39)
  twig_render_template('core/themes/stable9/templates/views/views-view-rss.html.twig', Array) (Line: 348)
  Drupal\Core\Theme\ThemeManager->render('views_view_rss', Array) (Line: 480)
  Drupal\Core\Render\Renderer->doRender(Array) (Line: 493)
  Drupal\Core\Render\Renderer->doRender(Array, 1) (Line: 240)
  Drupal\Core\Render\Renderer->render(Array, 1) (Line: 153)
  Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 627)
  Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 152)
  Drupal\Core\Render\Renderer->renderRoot(Array) (Line: 109)
  Drupal\views\Plugin\views\display\Feed::buildResponse('taxonomy_term', 'feed_1', Array) (Line: 56)
  Drupal\views\Routing\ViewPageController->handle('taxonomy_term', 'feed_1', Object)
  call_user_func_array(Array, Array) (Line: 123)
  Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 627)
  Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 121)
  Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
  Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 181)
  Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 76)
  Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
  Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
  Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 28)
  Drupal\Core\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 191)
  Drupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 128)
  Drupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 82)
  Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
  Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
  Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 36)
  Drupal\Core\StackMiddleware\AjaxPageState->handle(Object, 1, 1) (Line: 51)
  Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 704)
  Drupal\Core\DrupalKernel->handle(Object) (Line: 19)