Error message

• Warning: Undefined array key "render element" in Drupal\Core\Theme\ThemeManager->render() (line 202 of core/lib/Drupal/Core/Theme/ThemeManager.php).

  Drupal\Core\Theme\ThemeManager->render() (Line: 491)
  Drupal\Core\Render\Renderer->doRender() (Line: 248)
  Drupal\Core\Render\Renderer->render() (Line: 238)
  Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 638)
  Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 239)
  Drupal\Core\Render\MainContent\HtmlRenderer->prepare() (Line: 128)
  Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse() (Line: 90)
  Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray()
  call_user_func() (Line: 111)
  Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 186)
  Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76)
  Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53)
  Drupal\Core\StackMiddleware\Session->handle() (Line: 48)
  Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28)
  Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 32)
  Drupal\big_pipe\StackMiddleware\ContentLength->handle() (Line: 201)
  Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 138)
  Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 87)
  Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 206)
  Drupal\cleantalk\EventSubscriber\BootSubscriber->handle() (Line: 48)
  Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)
  Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 36)
  Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 51)
  Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 741)
  Drupal\Core\DrupalKernel->handle() (Line: 19)
  

• Warning: Undefined array key "render element" in Drupal\Core\Theme\ThemeManager->render() (line 204 of core/lib/Drupal/Core/Theme/ThemeManager.php).

  Drupal\Core\Theme\ThemeManager->render() (Line: 491)
  Drupal\Core\Render\Renderer->doRender() (Line: 248)
  Drupal\Core\Render\Renderer->render() (Line: 238)
  Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 638)
  Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 239)
  Drupal\Core\Render\MainContent\HtmlRenderer->prepare() (Line: 128)
  Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse() (Line: 90)
  Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray()
  call_user_func() (Line: 111)
  Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 186)
  Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76)
  Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53)
  Drupal\Core\StackMiddleware\Session->handle() (Line: 48)
  Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28)
  Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 32)
  Drupal\big_pipe\StackMiddleware\ContentLength->handle() (Line: 201)
  Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 138)
  Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 87)
  Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 206)
  Drupal\cleantalk\EventSubscriber\BootSubscriber->handle() (Line: 48)
  Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)
  Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 36)
  Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 51)
  Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 741)
  Drupal\Core\DrupalKernel->handle() (Line: 19)