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Twig\Error\RuntimeError: The "filter" filter expects an array or "Traversable", got "integer". in twig_array_filter() (line 37 of themes/adaptivetheme/at_core/templates/layout/book-export-html.html.twig).
__TwigTemplate_1754909986d18b0e142ba107d3d984fe->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/adaptivetheme/at_core/templates/layout/book-export-html.html.twig', Array) (Line: 384) Drupal\Core\Theme\ThemeManager->render('book_export_html', Array) (Line: 433) Drupal\Core\Render\Renderer->doRender(Array, 1) (Line: 204) Drupal\Core\Render\Renderer->render(Array, 1) (Line: 148) Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 580) Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 149) Drupal\Core\Render\Renderer->renderRoot(Array) (Line: 163) Drupal\book\Controller\BookController->bookExport('html', Object) call_user_func_array(Array, Array) (Line: 123) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 580) Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 169) 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: 718) Drupal\Core\DrupalKernel->handle(Object) (Line: 19)