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In this digital era, many organizations, such as corporate and government websites, eCommerce websites, and blogs, are built using Drupal. Millions of people and organizations all over the world use Drupal to build and maintain websites.

What is Drupal?ĭrupal is a free, open-source content management system (CMS) with a large, friendly community. Warning: Undefined variable $index in Drupal\responsive_bg_image_formatter\Plugin\Field\FieldFormatter\ResponsiveBgImageFormatter->viewElements() (line 153 of modules/custom/responsive_bg_image_formatter/src/Plugin/Field/FieldFormatter/ResponsiveBgImageFormatter.php).Let’s discuss why you should prefer Drupal and Drupal Themes.Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 718)ĭrupal\Core\DrupalKernel->handle(Object) (Line: 19) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)ĭrupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)ĭrupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 191)ĭrupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 128)ĭrupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 82)ĭrupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)ĭrupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)ĭrupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 81) See ', 'exception', 'Drupal\Core\Render\Element\RenderCallbackInterface') (Line: 788)ĭrupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array) (Line: 374)ĭrupal\Core\Render\Renderer->doRender(Array, ) (Line: 204)ĭrupal\Core\Render\Renderer->render(Array, ) (Line: 242)ĭrupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\() (Line: 580)ĭrupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 243)ĭrupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 132)ĭrupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)ĭrupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object)Ĭall_user_func(Array, Object, 'kernel.view', Object) (Line: 142)ĭrupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.view') (Line: 174)

Drupal\responsive_bg_image_formatter\Plugin\Field\FieldFormatter\ResponsiveBgImageFormatter->viewElements(Object, 'en') (Line: 89)ĭrupal\Core\Field\FormatterBase->view(Object, 'en') (Line: 76)ĭrupal\Core\Field\Plugin\Field\FieldFormatter\EntityReferenceFormatterBase->view(Object, NULL) (Line: 265)ĭrupal\Core\Entity\Entity\EntityViewDisplay->buildMultiple(Array) (Line: 340)ĭrupal\Core\Entity\EntityViewBuilder->buildComponents(Array, Array, Array, 'full') (Line: 24)ĭrupal\node\NodeViewBuilder->buildComponents(Array, Array, Array, 'full') (Line: 282)ĭrupal\Core\Entity\EntityViewBuilder->buildMultiple(Array) (Line: 239)ĭrupal\Core\Entity\EntityViewBuilder->build(Array)Ĭall_user_func_array(Array, Array) (Line: 101)ĭrupal\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.