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Twig\Error\SyntaxError: Unexpected token "name" of value "if" ("end of statement block" expected). in Twig\TokenStream->expect() (line 39 of themes/drupalbase_custom/templates/book/book-export-html.html.twig).
Twig\TokenParser\ForTokenParser->parse(Object) (Line: 170) Twig\Parser->subparse(NULL, ) (Line: 83) Twig\Parser->parse(Object) (Line: 491) Twig\Environment->parse(Object) (Line: 519) Twig\Environment->compileSource(Object) (Line: 131) Drupal\Core\Template\TwigEnvironment->compileSource(Object) (Line: 351) Twig\Environment->loadTemplate('__TwigTemplate_b78d2a2ed299efde7fbf8ec321a58cd5', 'themes/drupalbase_custom/templates/book/book-export-html.html.twig') (Line: 312) Twig\Environment->load('themes/drupalbase_custom/templates/book/book-export-html.html.twig') (Line: 53) twig_render_template('themes/drupalbase_custom/templates/book/book-export-html.html.twig', Array) (Line: 372) Drupal\Core\Theme\ThemeManager->render('book_export_html', Array) (Line: 445) 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: 592) 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: 592) 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: 181) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 76) 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: 51) Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 704) Drupal\Core\DrupalKernel->handle(Object) (Line: 19)