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TypeError: strtolower(): Argument #1 ($string) must be of type string, array given in strtolower() (line 174 of themes/custom/nttdata_theme/nttdata_theme.theme).
strtolower() (Line: 174) nttdata_theme_preprocess_views_view() call_user_func_array() (Line: 287) Drupal\Core\Theme\ThemeManager->render() (Line: 422) Drupal\Core\Render\Renderer->doRender() (Line: 435) Drupal\Core\Render\Renderer->doRender() (Line: 201) Drupal\Core\Render\Renderer->render() (Line: 479) Drupal\Core\Template\TwigExtension->escapeFilter() (Line: 169) __TwigTemplate_bdd0e66ccee255213a425954c1234fc27655c21b1851125febe50182df04a25b->block_content() (Line: 182) Twig\Template->displayBlock() (Line: 100) __TwigTemplate_bdd0e66ccee255213a425954c1234fc27655c21b1851125febe50182df04a25b->doDisplay() (Line: 405) Twig\Template->displayWithErrorHandling() (Line: 378) Twig\Template->display() (Line: 390) Twig\Template->render() (Line: 55) twig_render_template() (Line: 384) Drupal\Core\Theme\ThemeManager->render() (Line: 422) Drupal\Core\Render\Renderer->doRender() (Line: 201) Drupal\Core\Render\Renderer->render() (Line: 479) Drupal\Core\Template\TwigExtension->escapeFilter() (Line: 84) __TwigTemplate_0d4a74e4a90622f163bde7786bde70ca4f3b79db1d025ecec8fb9dbe01916e67->doDisplay() (Line: 405) Twig\Template->displayWithErrorHandling() (Line: 378) Twig\Template->display() (Line: 390) Twig\Template->render() (Line: 55) twig_render_template() (Line: 384) Drupal\Core\Theme\ThemeManager->render() (Line: 422) Drupal\Core\Render\Renderer->doRender() (Line: 201) Drupal\Core\Render\Renderer->render() (Line: 162) Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 564) Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 163) Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse() (Line: 90) Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray() call_user_func() (Line: 142) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 174) 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: 270) Drupal\shield\ShieldMiddleware->bypass() (Line: 137) Drupal\shield\ShieldMiddleware->handle() (Line: 48) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 23) Stack\StackedHttpKernel->handle() (Line: 709) Drupal\Core\DrupalKernel->handle() (Line: 19)