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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)