Error message
Warning: Undefined array key "u" in Drupal\nafkam_utils\ThemePage->generateLetterView() (line 209 of modules/custom/nafkam_utils/src/ThemePage.php).
Drupal\nafkam_utils\ThemePage->generateLetterView('u') (Line: 98) Drupal\nafkam_utils\ThemePage->renderPage() (Line: 124) nafkam_utils_preprocess_paragraph(Array, 'paragraph', Array) call_user_func_array('nafkam_utils_preprocess_paragraph', Array) (Line: 261) Drupal\Core\Theme\ThemeManager->render('paragraph', Array) (Line: 480) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240) Drupal\Core\Render\Renderer->render(Array) (Line: 475) Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 68) __TwigTemplate_e8040858f3b02d28e3aac89a56b0c3e8->doDisplay(Array, Array) (Line: 394) Twig\Template->displayWithErrorHandling(Array, Array) (Line: 367) Twig\Template->display(Array) (Line: 379) Twig\Template->render(Array) (Line: 38) Twig\TemplateWrapper->render(Array) (Line: 39) twig_render_template('themes/contrib/classy/templates/field/field.html.twig', Array) (Line: 348) Drupal\Core\Theme\ThemeManager->render('field', Array) (Line: 480) Drupal\Core\Render\Renderer->doRender(Array) (Line: 493) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240) Drupal\Core\Render\Renderer->render(Array) (Line: 475) Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 110) __TwigTemplate_6506e4452dfebc2a3491f76ef4896f49->doDisplay(Array, Array) (Line: 394) Twig\Template->displayWithErrorHandling(Array, Array) (Line: 367) Twig\Template->display(Array) (Line: 379) Twig\Template->render(Array) (Line: 38) Twig\TemplateWrapper->render(Array) (Line: 39) twig_render_template('themes/contrib/classy/templates/content/node.html.twig', Array) (Line: 348) Drupal\Core\Theme\ThemeManager->render('node', Array) (Line: 480) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240) Drupal\Core\Render\Renderer->render(Array, ) (Line: 238) Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 627) Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 239) Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 128) Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90) Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object) call_user_func(Array, Object, 'kernel.view', Object) (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.view') (Line: 186) 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: 28) Drupal\Core\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 32) Drupal\big_pipe\StackMiddleware\ContentLength->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: 36) Drupal\Core\StackMiddleware\AjaxPageState->handle(Object, 1, 1) (Line: 51) Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 704) Drupal\Core\DrupalKernel->handle(Object) (Line: 19)Warning: foreach() argument must be of type array|object, null given in Drupal\nafkam_utils\ThemePage->generateLetterView() (line 209 of modules/custom/nafkam_utils/src/ThemePage.php).
Drupal\nafkam_utils\ThemePage->generateLetterView('u') (Line: 98) Drupal\nafkam_utils\ThemePage->renderPage() (Line: 124) nafkam_utils_preprocess_paragraph(Array, 'paragraph', Array) call_user_func_array('nafkam_utils_preprocess_paragraph', Array) (Line: 261) Drupal\Core\Theme\ThemeManager->render('paragraph', Array) (Line: 480) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240) Drupal\Core\Render\Renderer->render(Array) (Line: 475) Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 68) __TwigTemplate_e8040858f3b02d28e3aac89a56b0c3e8->doDisplay(Array, Array) (Line: 394) Twig\Template->displayWithErrorHandling(Array, Array) (Line: 367) Twig\Template->display(Array) (Line: 379) Twig\Template->render(Array) (Line: 38) Twig\TemplateWrapper->render(Array) (Line: 39) twig_render_template('themes/contrib/classy/templates/field/field.html.twig', Array) (Line: 348) Drupal\Core\Theme\ThemeManager->render('field', Array) (Line: 480) Drupal\Core\Render\Renderer->doRender(Array) (Line: 493) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240) Drupal\Core\Render\Renderer->render(Array) (Line: 475) Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 110) __TwigTemplate_6506e4452dfebc2a3491f76ef4896f49->doDisplay(Array, Array) (Line: 394) Twig\Template->displayWithErrorHandling(Array, Array) (Line: 367) Twig\Template->display(Array) (Line: 379) Twig\Template->render(Array) (Line: 38) Twig\TemplateWrapper->render(Array) (Line: 39) twig_render_template('themes/contrib/classy/templates/content/node.html.twig', Array) (Line: 348) Drupal\Core\Theme\ThemeManager->render('node', Array) (Line: 480) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240) Drupal\Core\Render\Renderer->render(Array, ) (Line: 238) Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 627) Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 239) Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 128) Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90) Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object) call_user_func(Array, Object, 'kernel.view', Object) (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.view') (Line: 186) 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: 28) Drupal\Core\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 32) Drupal\big_pipe\StackMiddleware\ContentLength->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: 36) Drupal\Core\StackMiddleware\AjaxPageState->handle(Object, 1, 1) (Line: 51) Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 704) Drupal\Core\DrupalKernel->handle(Object) (Line: 19)