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TypeError: Drupal\book\BookManager::bookTreeOutput(): Argument #1 ($tree) must be of type array, null given, called in /var/www/conciliationresources/web/core/modules/book/src/Plugin/Block/BookNavigationBlock.php on line 188 in Drupal\book\BookManager->bookTreeOutput() (line 593 of core/modules/book/src/BookManager.php).
Drupal\book\BookManager->bookTreeOutput() (Line: 188)
Drupal\book\Plugin\Block\BookNavigationBlock->build() (Line: 171)
Drupal\block\BlockViewBuilder::preRender()
call_user_func_array() (Line: 101)
Drupal\Core\Render\Renderer->doTrustedCallback() (Line: 788)
Drupal\Core\Render\Renderer->doCallback() (Line: 374)
Drupal\Core\Render\Renderer->doRender() (Line: 204)
Drupal\Core\Render\Renderer->render() (Line: 160)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 580)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 161)
Drupal\Core\Render\Renderer->renderPlain() (Line: 175)
Drupal\Core\Render\Renderer->renderPlaceholder() (Line: 665)
Drupal\Core\Render\Renderer->replacePlaceholders() (Line: 550)
Drupal\Core\Render\Renderer->doRender() (Line: 204)
Drupal\Core\Render\Renderer->render() (Line: 148)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 580)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 149)
Drupal\Core\Render\Renderer->renderRoot() (Line: 278)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->renderPlaceholders() (Line: 71)
Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor->processAttachments() (Line: 45)
Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond()
call_user_func() (Line: 142)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 202)
Symfony\Component\HttpKernel\HttpKernel->filterResponse() (Line: 190)
Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 81)
Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 58)
Drupal\Core\StackMiddleware\Session->handle() (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 191)
Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 128)
Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 82)
Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 23)
Stack\StackedHttpKernel->handle() (Line: 718)
Drupal\Core\DrupalKernel->handle() (Line: 19)