Error message

• Notice: Undefined index: id in Drupal\views\Plugin\views\display\DisplayPluginBase->getHandlers() (line 864 of core/modules/views/src/Plugin/views/display/DisplayPluginBase.php).

  Drupal\views\Plugin\views\display\DisplayPluginBase->getHandlers('footer') (Line: 1040)
  Drupal\views\ViewExecutable->_initHandler('footer', Array) (Line: 898)
  Drupal\views\ViewExecutable->initHandlers() (Line: 2319)
  Drupal\views\Plugin\views\display\DisplayPluginBase->preExecute() (Line: 1692)
  Drupal\views\ViewExecutable->preExecute(Array) (Line: 1627)
  Drupal\views\ViewExecutable->executeDisplay('block_3', Array) (Line: 81)
  Drupal\views\Element\View::preRenderViewElement(Array) (Line: 59)
  Drupal\views\Plugin\Block\ViewsBlock->build() (Line: 171)
  Drupal\block\BlockViewBuilder::preRender(Array)
  call_user_func_array(Array, Array) (Line: 101)
  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: 772)
  Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array) (Line: 363)
  Drupal\Core\Render\Renderer->doRender(Array) (Line: 435)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 201)
  Drupal\Core\Render\Renderer->render(Array) (Line: 479)
  Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 105)
  __TwigTemplate_2498beb3692811bdd7c07fc88a6d639566375d48cc8f02a6ef5c73e502c3ed53->doDisplay(Array, Array) (Line: 405)
  Twig\Template->displayWithErrorHandling(Array, Array) (Line: 378)
  Twig\Template->display(Array) (Line: 390)
  Twig\Template->render(Array) (Line: 55)
  twig_render_template('themes/custom/unisannio/templates/system/page--front.html.twig', Array) (Line: 384)
  Drupal\Core\Theme\ThemeManager->render('page', Array) (Line: 422)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 201)
  Drupal\Core\Render\Renderer->render(Array) (Line: 479)
  Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 91)
  __TwigTemplate_db06519836164d5e6b9da7a0b2670dd5375ccbcb10a4103c69fbdb587fe39a1e->doDisplay(Array, Array) (Line: 405)
  Twig\Template->displayWithErrorHandling(Array, Array) (Line: 378)
  Twig\Template->display(Array) (Line: 390)
  Twig\Template->render(Array) (Line: 55)
  twig_render_template('themes/custom/unisannio/templates/system/html.html.twig', Array) (Line: 384)
  Drupal\Core\Theme\ThemeManager->render('html', Array) (Line: 422)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 201)
  Drupal\Core\Render\Renderer->render(Array) (Line: 162)
  Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 564)
  Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 163)
  Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
  Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object)
  call_user_func(Array, Object, 'kernel.view', Object) (Line: 142)
  Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.view') (Line: 164)
  Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 81)
  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: 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: 23)
  Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 709)
  Drupal\Core\DrupalKernel->handle(Object) (Line: 19)
  

• Notice: Undefined index: table in Drupal\views\Plugin\ViewsHandlerManager->getHandler() (line 82 of core/modules/views/src/Plugin/ViewsHandlerManager.php).

  Drupal\views\Plugin\ViewsHandlerManager->getHandler(Array, NULL) (Line: 889)
  Drupal\views\Plugin\views\display\DisplayPluginBase->getHandlers('footer') (Line: 1040)
  Drupal\views\ViewExecutable->_initHandler('footer', Array) (Line: 898)
  Drupal\views\ViewExecutable->initHandlers() (Line: 2319)
  Drupal\views\Plugin\views\display\DisplayPluginBase->preExecute() (Line: 1692)
  Drupal\views\ViewExecutable->preExecute(Array) (Line: 1627)
  Drupal\views\ViewExecutable->executeDisplay('block_3', Array) (Line: 81)
  Drupal\views\Element\View::preRenderViewElement(Array) (Line: 59)
  Drupal\views\Plugin\Block\ViewsBlock->build() (Line: 171)
  Drupal\block\BlockViewBuilder::preRender(Array)
  call_user_func_array(Array, Array) (Line: 101)
  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: 772)
  Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array) (Line: 363)
  Drupal\Core\Render\Renderer->doRender(Array) (Line: 435)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 201)
  Drupal\Core\Render\Renderer->render(Array) (Line: 479)
  Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 105)
  __TwigTemplate_2498beb3692811bdd7c07fc88a6d639566375d48cc8f02a6ef5c73e502c3ed53->doDisplay(Array, Array) (Line: 405)
  Twig\Template->displayWithErrorHandling(Array, Array) (Line: 378)
  Twig\Template->display(Array) (Line: 390)
  Twig\Template->render(Array) (Line: 55)
  twig_render_template('themes/custom/unisannio/templates/system/page--front.html.twig', Array) (Line: 384)
  Drupal\Core\Theme\ThemeManager->render('page', Array) (Line: 422)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 201)
  Drupal\Core\Render\Renderer->render(Array) (Line: 479)
  Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 91)
  __TwigTemplate_db06519836164d5e6b9da7a0b2670dd5375ccbcb10a4103c69fbdb587fe39a1e->doDisplay(Array, Array) (Line: 405)
  Twig\Template->displayWithErrorHandling(Array, Array) (Line: 378)
  Twig\Template->display(Array) (Line: 390)
  Twig\Template->render(Array) (Line: 55)
  twig_render_template('themes/custom/unisannio/templates/system/html.html.twig', Array) (Line: 384)
  Drupal\Core\Theme\ThemeManager->render('html', Array) (Line: 422)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 201)
  Drupal\Core\Render\Renderer->render(Array) (Line: 162)
  Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 564)
  Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 163)
  Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
  Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object)
  call_user_func(Array, Object, 'kernel.view', Object) (Line: 142)
  Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.view') (Line: 164)
  Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 81)
  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: 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: 23)
  Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 709)
  Drupal\Core\DrupalKernel->handle(Object) (Line: 19)
  

• Notice: Undefined index: field in Drupal\views\Plugin\ViewsHandlerManager->getHandler() (line 83 of core/modules/views/src/Plugin/ViewsHandlerManager.php).

  Drupal\views\Plugin\ViewsHandlerManager->getHandler(Array, NULL) (Line: 889)
  Drupal\views\Plugin\views\display\DisplayPluginBase->getHandlers('footer') (Line: 1040)
  Drupal\views\ViewExecutable->_initHandler('footer', Array) (Line: 898)
  Drupal\views\ViewExecutable->initHandlers() (Line: 2319)
  Drupal\views\Plugin\views\display\DisplayPluginBase->preExecute() (Line: 1692)
  Drupal\views\ViewExecutable->preExecute(Array) (Line: 1627)
  Drupal\views\ViewExecutable->executeDisplay('block_3', Array) (Line: 81)
  Drupal\views\Element\View::preRenderViewElement(Array) (Line: 59)
  Drupal\views\Plugin\Block\ViewsBlock->build() (Line: 171)
  Drupal\block\BlockViewBuilder::preRender(Array)
  call_user_func_array(Array, Array) (Line: 101)
  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: 772)
  Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array) (Line: 363)
  Drupal\Core\Render\Renderer->doRender(Array) (Line: 435)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 201)
  Drupal\Core\Render\Renderer->render(Array) (Line: 479)
  Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 105)
  __TwigTemplate_2498beb3692811bdd7c07fc88a6d639566375d48cc8f02a6ef5c73e502c3ed53->doDisplay(Array, Array) (Line: 405)
  Twig\Template->displayWithErrorHandling(Array, Array) (Line: 378)
  Twig\Template->display(Array) (Line: 390)
  Twig\Template->render(Array) (Line: 55)
  twig_render_template('themes/custom/unisannio/templates/system/page--front.html.twig', Array) (Line: 384)
  Drupal\Core\Theme\ThemeManager->render('page', Array) (Line: 422)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 201)
  Drupal\Core\Render\Renderer->render(Array) (Line: 479)
  Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 91)
  __TwigTemplate_db06519836164d5e6b9da7a0b2670dd5375ccbcb10a4103c69fbdb587fe39a1e->doDisplay(Array, Array) (Line: 405)
  Twig\Template->displayWithErrorHandling(Array, Array) (Line: 378)
  Twig\Template->display(Array) (Line: 390)
  Twig\Template->render(Array) (Line: 55)
  twig_render_template('themes/custom/unisannio/templates/system/html.html.twig', Array) (Line: 384)
  Drupal\Core\Theme\ThemeManager->render('html', Array) (Line: 422)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 201)
  Drupal\Core\Render\Renderer->render(Array) (Line: 162)
  Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 564)
  Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 163)
  Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
  Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object)
  call_user_func(Array, Object, 'kernel.view', Object) (Line: 142)
  Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.view') (Line: 164)
  Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 81)
  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: 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: 23)
  Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 709)
  Drupal\Core\DrupalKernel->handle(Object) (Line: 19)