Error message
Deprecated function: Return type of InlineCSS::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in include_once() (line 147 of themes/main/main.theme).
include_once() (Line: 153) Drupal\Core\Extension\Extension->load() (Line: 137) Drupal\Core\Theme\ThemeInitialization->loadActiveTheme() (Line: 74) Drupal\Core\Theme\ThemeInitialization->initTheme() (Line: 415) Drupal\Core\Theme\ThemeManager->initTheme() (Line: 95) Drupal\Core\Theme\ThemeManager->getActiveTheme() (Line: 230) Drupal\Core\Theme\Registry->init() (Line: 317) Drupal\Core\Theme\Registry->getRuntime() (Line: 194) Drupal\Core\Entity\EntityViewBuilder->getBuildDefaults() (Line: 61) Drupal\node\NodeViewBuilder->getBuildDefaults() (Line: 157) Drupal\Core\Entity\EntityViewBuilder->viewMultiple() (Line: 123) Drupal\Core\Entity\EntityViewBuilder->view() (Line: 134) Drupal\Core\Entity\Controller\EntityViewController->view() (Line: 66) Drupal\node\Controller\NodeViewController->view() call_user_func_array() (Line: 123) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->{closure:Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber::wrapControllerExecutionInRenderContext():121}() (Line: 637) Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 121) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext() (Line: 97) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->{closure:Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber::onController():96}() (Line: 181) Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76) Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53) Drupal\Core\StackMiddleware\Session->handle() (Line: 48) Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28) Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 48) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 36) Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 51) Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 741) Drupal\Core\DrupalKernel->handle() (Line: 19)Deprecated function: Return type of Drupal\picture_background_formatter\Component\Render\CSSSnippet::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in include() (line 7 of modules/custom/picture_background_formatter/src/Component/Render/CSSSnippet.php).
include() (Line: 576) {closure:Composer\Autoload\ClassLoader::initializeIncludeClosure():575}() (Line: 427) Composer\Autoload\ClassLoader->loadClass() unserialize() (Line: 21) Drupal\Component\Serialization\PhpSerialize::decode() (Line: 201) Drupal\Core\Cache\DatabaseBackend->prepareItem() (Line: 156) Drupal\Core\Cache\DatabaseBackend->getMultiple() (Line: 126) Drupal\Core\Cache\DatabaseBackend->get() (Line: 218) Drupal\Core\Cache\VariationCache->getRedirectChain() (Line: 35) Drupal\Core\Cache\VariationCache->get() (Line: 67) Drupal\Core\Render\RenderCache->get() (Line: 109) Drupal\Core\Render\PlaceholderingRenderCache->get() (Line: 325) Drupal\Core\Render\Renderer->doRender() (Line: 503) Drupal\Core\Render\Renderer->doRender() (Line: 248) Drupal\Core\Render\Renderer->render() (Line: 484) Drupal\Core\Template\TwigExtension->escapeFilter() (Line: 125) __TwigTemplate_a18dce5ab8550a203eb036af1f80e4bc->doDisplay() (Line: 388) Twig\Template->yield() (Line: 344) Twig\Template->display() (Line: 359) Twig\Template->render() (Line: 51) Twig\TemplateWrapper->render() (Line: 33) twig_render_template() (Line: 348) Drupal\Core\Theme\ThemeManager->render() (Line: 490) Drupal\Core\Render\Renderer->doRender() (Line: 248) Drupal\Core\Render\Renderer->render() (Line: 484) Drupal\Core\Template\TwigExtension->escapeFilter() (Line: 124) __TwigTemplate_63be3ec5499b439152f3229c0fa4323c->doDisplay() (Line: 388) Twig\Template->yield() (Line: 344) Twig\Template->display() (Line: 359) Twig\Template->render() (Line: 51) Twig\TemplateWrapper->render() (Line: 33) twig_render_template() (Line: 348) Drupal\Core\Theme\ThemeManager->render() (Line: 490) Drupal\Core\Render\Renderer->doRender() (Line: 248) Drupal\Core\Render\Renderer->render() (Line: 158) Drupal\Core\Render\MainContent\HtmlRenderer->{closure:Drupal\Core\Render\MainContent\HtmlRenderer::renderResponse():153}() (Line: 637) Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 153) Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse() (Line: 90) Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray() call_user_func() (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 186) Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76) Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53) Drupal\Core\StackMiddleware\Session->handle() (Line: 48) Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28) Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 48) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 36) Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 51) Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 741) Drupal\Core\DrupalKernel->handle() (Line: 19)
