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Drupal\Core\Database\DatabaseExceptionWrapper: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT "menu_tree"."menu_name" AS "menu_name", "menu_tree"."route_name" AS "route_name", "menu_tree"."route_parameters" AS "route_parameters", "menu_tree"."url" AS "url", "menu_tree"."title" AS "title", "menu_tree"."description" AS "description", "menu_tree"."parent" AS "parent", "menu_tree"."weight" AS "weight", "menu_tree"."options" AS "options", "menu_tree"."expanded" AS "expanded", "menu_tree"."enabled" AS "enabled", "menu_tree"."provider" AS "provider", "menu_tree"."metadata" AS "metadata", "menu_tree"."class" AS "class", "menu_tree"."form_class" AS "form_class", "menu_tree"."id" AS "id" FROM "menu_tree" "menu_tree" WHERE ("route_name" = :db_condition_placeholder_0) AND ("route_param_key" = :db_condition_placeholder_1) AND ("menu_name" = :db_condition_placeholder_2) ORDER BY "depth" ASC, "weight" ASC, "id" ASC; Array ( [:db_condition_placeholder_0] => entity.node.canonical [:db_condition_placeholder_1] => node=3049 [:db_condition_placeholder_2] => main ) in Drupal\Core\Menu\MenuTreeStorage->safeExecuteSelect() (line 220 of core/lib/Drupal/Core/Menu/MenuTreeStorage.php).
Drupal\Core\Database\StatementWrapperIterator->execute(Array, Array) (Line: 790)
Drupal\Core\Database\Connection->query('SELECT "menu_tree"."menu_name" AS "menu_name", "menu_tree"."route_name" AS "route_name", "menu_tree"."route_parameters" AS "route_parameters", "menu_tree"."url" AS "url", "menu_tree"."title" AS "title", "menu_tree"."description" AS "description", "menu_tree"."parent" AS "parent", "menu_tree"."weight" AS "weight", "menu_tree"."options" AS "options", "menu_tree"."expanded" AS "expanded", "menu_tree"."enabled" AS "enabled", "menu_tree"."provider" AS "provider", "menu_tree"."metadata" AS "metadata", "menu_tree"."class" AS "class", "menu_tree"."form_class" AS "form_class", "menu_tree"."id" AS "id"
FROM
{menu_tree} "menu_tree"
WHERE ("route_name" = :db_condition_placeholder_0) AND ("route_param_key" = :db_condition_placeholder_1) AND ("menu_name" = :db_condition_placeholder_2)
ORDER BY "depth" ASC, "weight" ASC, "id" ASC', Array, Array) (Line: 525)
Drupal\Core\Database\Query\Select->execute() (Line: 220)
Drupal\Core\Menu\MenuTreeStorage->safeExecuteSelect(Object) (Line: 676)
Drupal\Core\Menu\MenuTreeStorage->loadByRoute('entity.node.canonical', Array, 'main') (Line: 297)
Drupal\Core\Menu\MenuLinkManager->loadLinksByRoute('entity.node.canonical', Array, 'main') (Line: 134)
Drupal\Core\Menu\MenuActiveTrail->getActiveLink('main') (Line: 38)
Drupal\menu_item_extras\Cache\LinkItemContentActiveTrailsCacheContext->getContext('main:7ef5fc54-473a-4ca3-a2f3-601006c97391') (Line: 123)
Drupal\Core\Cache\Context\CacheContextsManager->convertTokensToKeys(Array) (Line: 317)
Drupal\Core\Render\RenderCache->createCacheID(Array) (Line: 274)
Drupal\Core\Render\RenderCache->set(Array, Array) (Line: 127)
Drupal\Core\Render\PlaceholderingRenderCache->set(Array, Array) (Line: 200)
Drupal\dynamic_page_cache\EventSubscriber\DynamicPageCacheSubscriber->onResponse(Object, 'kernel.response', Object)
call_user_func(Array, Object, 'kernel.response', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.response') (Line: 214)
Symfony\Component\HttpKernel\HttpKernel->filterResponse(Object, Object, 2) (Line: 202)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 2) (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 2, 1) (Line: 58)
Drupal\Core\StackMiddleware\Session->handle(Object, 2, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 2, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 2, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 2, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 2, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 2, 1) (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 2) (Line: 166)
Drupal\Core\EventSubscriber\DefaultExceptionHtmlSubscriber->makeSubrequest(Object, '/node/3049', 404) (Line: 119)
Drupal\Core\EventSubscriber\CustomPageExceptionHtmlSubscriber->makeSubrequestToCustomPath(Object, '/node/3049', 404) (Line: 81)
Drupal\Core\EventSubscriber\CustomPageExceptionHtmlSubscriber->on404(Object) (Line: 109)
Drupal\Core\EventSubscriber\HttpExceptionSubscriberBase->onException(Object, 'kernel.exception', Object)
call_user_func(Array, Object, 'kernel.exception', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.exception') (Line: 239)
Symfony\Component\HttpKernel\HttpKernel->handleThrowable(Object, Object, 1) (Line: 91)
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)