Error message

Warning: Undefined array key "pdf" in Drupal\sahapedia_block\Plugin\Block\LibraryArtifactsBlock->build() (line 163 of modules/custom/sahapedia_block/src/Plugin/Block/LibraryArtifactsBlock.php).
Drupal\sahapedia_block\Plugin\Block\LibraryArtifactsBlock->build() (Line: 171)
Drupal\block\BlockViewBuilder::preRender(Array)
call_user_func_array('Drupal\block\BlockViewBuilder::preRender', Array) (Line: 113)
Drupal\Core\Render\Renderer->doTrustedCallback('Drupal\block\BlockViewBuilder::preRender', 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: 870)
Drupal\Core\Render\Renderer->doCallback('#pre_render', 'Drupal\block\BlockViewBuilder::preRender', Array) (Line: 432)
Drupal\Core\Render\Renderer->doRender(Array, 1) (Line: 248)
Drupal\Core\Render\Renderer->render(Array, 1) (Line: 165)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 638)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 164)
Drupal\Core\Render\Renderer->renderInIsolation(Array) (Line: 191)
Drupal\Core\Render\Renderer->doRenderPlaceholder(Array) (Line: 723)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}()
Fiber->start() (Line: 731)
Drupal\Core\Render\Renderer->replacePlaceholders(Array) (Line: 608)
Drupal\Core\Render\Renderer->doRender(Array, 1) (Line: 248)
Drupal\Core\Render\Renderer->render(Array, 1) (Line: 153)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 638)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 152)
Drupal\Core\Render\Renderer->renderRoot(Array) (Line: 288)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->renderPlaceholders(Object) (Line: 74)
Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor->processAttachments(Object) (Line: 45)
Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond(Object, 'kernel.response', Object)
call_user_func(Array, Object, 'kernel.response', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.response') (Line: 214)
Symfony\Component\HttpKernel\HttpKernel->filterResponse(Object, Object, 1) (Line: 160)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 53)
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: 32)
Drupal\big_pipe\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: 741)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)
Mishra or Gop raas

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