Uncaught exception thrown in session handler.

Drupal\Core\Database\DatabaseExceptionWrapper: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT 1 AS expression FROM {sessions} sessions WHERE sid = :db_condition_placeholder_0; Array ( [:db_condition_placeholder_0] => lXnNwM3Tf-Y79vHj04e83mVUmA-zSvdQSAYOmOkvViQ ) in Drupal\Core\Session\SessionHandler->write() (line 84 of /var/www/html/qixique/core/lib/Drupal/Core/Session/SessionHandler.php).
Drupal\Core\Session\SessionHandler->write('ezeSEn9yTp58OeEZEBYcScVVWX39AF5eePJ5eBdBKfg', '_symfony_flashes|a:1:{s:5:"error";a:1:{i:0;O:25:"Drupal\Core\Render\Markup":1:{s:9:"*string";s:2620:"<em class="placeholder">Warning</em>: Error while sending QUERY packet. PID=18283 in <em class="placeholder">Drupal\Core\Database\Statement-&gt;execute()</em> (line <em class="placeholder">59</em> of <em class="placeholder">core/lib/Drupal/Core/Database/Statement.php</em>). Drupal\Core\Database\Statement-&gt;execute(Array, Array) (Line: 640)
Drupal\Core\Database\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_bootstrap} WHERE cid IN ( :cids__0 ) ORDER BY cid&#039;, Array, Array) (Line: 357)
Drupal\Core\Database\Driver\mysql\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_bootstrap} WHERE cid IN ( :cids[] ) ORDER BY cid&#039;, Array) (Line: 113)
Drupal\Core\Cache\DatabaseBackend-&gt;getMultiple(Array, ) (Line: 92)
Drupal\Core\Cache\DatabaseBackend-&gt;get(&#039;user_permissions_hash:anonymous&#039;) (Line: 73)
Drupal\Core\Session\PermissionsHashGenerator-&gt;generate(Object) (Line: 47)
Drupal\Core\Cache\Context\AccountPermissionsCacheContext-&gt;getContext(NULL) (Line: 118)
Drupal\Core\Cache\Context\CacheContextsManager-&gt;convertTokensToKeys(Array) (Line: 307)
Drupal\Core\Render\RenderCache-&gt;createCacheID(Array) (Line: 66)
Drupal\Core\Render\RenderCache-&gt;get(Array) (Line: 109)
Drupal\Core\Render\PlaceholderingRenderCache-&gt;get(Array) (Line: 77)
Drupal\Core\Render\RenderCache-&gt;get(Array) (Line: 109)
Drupal\Core\Render\PlaceholderingRenderCache-&gt;get(Array) (Line: 137)
Drupal\dynamic_page_cache\EventSubscriber\DynamicPageCacheSubscriber-&gt;onRequest(Object, &#039;kernel.request&#039;, Object)
call_user_func(Array, Object, &#039;kernel.request&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.request&#039;, Object) (Line: 127)
Symfony\Component\HttpKernel\HttpKernel-&gt;handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel-&gt;handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle-&gt;handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache-&gt;pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware-&gt;handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware-&gt;handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel-&gt;handle(Object, 1, 1) (Line: 708)
Drupal\Core\DrupalKernel-&gt;handle(Object) (Line: 19)
";}}}_sf2_meta|a:3:{s:1:"u";i:1777483603;s:1:"c";i:1777483603;s:1:"l";s:7:"2000000";}') (Line: 89)
Drupal\Core\Session\WriteSafeSessionHandler->write('ezeSEn9yTp58OeEZEBYcScVVWX39AF5eePJ5eBdBKfg', '_symfony_flashes|a:1:{s:5:"error";a:1:{i:0;O:25:"Drupal\Core\Render\Markup":1:{s:9:"*string";s:2620:"<em class="placeholder">Warning</em>: Error while sending QUERY packet. PID=18283 in <em class="placeholder">Drupal\Core\Database\Statement-&gt;execute()</em> (line <em class="placeholder">59</em> of <em class="placeholder">core/lib/Drupal/Core/Database/Statement.php</em>). Drupal\Core\Database\Statement-&gt;execute(Array, Array) (Line: 640)
Drupal\Core\Database\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_bootstrap} WHERE cid IN ( :cids__0 ) ORDER BY cid&#039;, Array, Array) (Line: 357)
Drupal\Core\Database\Driver\mysql\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_bootstrap} WHERE cid IN ( :cids[] ) ORDER BY cid&#039;, Array) (Line: 113)
Drupal\Core\Cache\DatabaseBackend-&gt;getMultiple(Array, ) (Line: 92)
Drupal\Core\Cache\DatabaseBackend-&gt;get(&#039;user_permissions_hash:anonymous&#039;) (Line: 73)
Drupal\Core\Session\PermissionsHashGenerator-&gt;generate(Object) (Line: 47)
Drupal\Core\Cache\Context\AccountPermissionsCacheContext-&gt;getContext(NULL) (Line: 118)
Drupal\Core\Cache\Context\CacheContextsManager-&gt;convertTokensToKeys(Array) (Line: 307)
Drupal\Core\Render\RenderCache-&gt;createCacheID(Array) (Line: 66)
Drupal\Core\Render\RenderCache-&gt;get(Array) (Line: 109)
Drupal\Core\Render\PlaceholderingRenderCache-&gt;get(Array) (Line: 77)
Drupal\Core\Render\RenderCache-&gt;get(Array) (Line: 109)
Drupal\Core\Render\PlaceholderingRenderCache-&gt;get(Array) (Line: 137)
Drupal\dynamic_page_cache\EventSubscriber\DynamicPageCacheSubscriber-&gt;onRequest(Object, &#039;kernel.request&#039;, Object)
call_user_func(Array, Object, &#039;kernel.request&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.request&#039;, Object) (Line: 127)
Symfony\Component\HttpKernel\HttpKernel-&gt;handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel-&gt;handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle-&gt;handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache-&gt;pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware-&gt;handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware-&gt;handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel-&gt;handle(Object, 1, 1) (Line: 708)
Drupal\Core\DrupalKernel-&gt;handle(Object) (Line: 19)
";}}}_sf2_meta|a:3:{s:1:"u";i:1777483603;s:1:"c";i:1777483603;s:1:"l";s:7:"2000000";}') (Line: 67)
Symfony\Component\HttpFoundation\Session\Storage\Proxy\SessionHandlerProxy->write('ezeSEn9yTp58OeEZEBYcScVVWX39AF5eePJ5eBdBKfg', '_symfony_flashes|a:1:{s:5:"error";a:1:{i:0;O:25:"Drupal\Core\Render\Markup":1:{s:9:"*string";s:2620:"<em class="placeholder">Warning</em>: Error while sending QUERY packet. PID=18283 in <em class="placeholder">Drupal\Core\Database\Statement-&gt;execute()</em> (line <em class="placeholder">59</em> of <em class="placeholder">core/lib/Drupal/Core/Database/Statement.php</em>). Drupal\Core\Database\Statement-&gt;execute(Array, Array) (Line: 640)
Drupal\Core\Database\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_bootstrap} WHERE cid IN ( :cids__0 ) ORDER BY cid&#039;, Array, Array) (Line: 357)
Drupal\Core\Database\Driver\mysql\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_bootstrap} WHERE cid IN ( :cids[] ) ORDER BY cid&#039;, Array) (Line: 113)
Drupal\Core\Cache\DatabaseBackend-&gt;getMultiple(Array, ) (Line: 92)
Drupal\Core\Cache\DatabaseBackend-&gt;get(&#039;user_permissions_hash:anonymous&#039;) (Line: 73)
Drupal\Core\Session\PermissionsHashGenerator-&gt;generate(Object) (Line: 47)
Drupal\Core\Cache\Context\AccountPermissionsCacheContext-&gt;getContext(NULL) (Line: 118)
Drupal\Core\Cache\Context\CacheContextsManager-&gt;convertTokensToKeys(Array) (Line: 307)
Drupal\Core\Render\RenderCache-&gt;createCacheID(Array) (Line: 66)
Drupal\Core\Render\RenderCache-&gt;get(Array) (Line: 109)
Drupal\Core\Render\PlaceholderingRenderCache-&gt;get(Array) (Line: 77)
Drupal\Core\Render\RenderCache-&gt;get(Array) (Line: 109)
Drupal\Core\Render\PlaceholderingRenderCache-&gt;get(Array) (Line: 137)
Drupal\dynamic_page_cache\EventSubscriber\DynamicPageCacheSubscriber-&gt;onRequest(Object, &#039;kernel.request&#039;, Object)
call_user_func(Array, Object, &#039;kernel.request&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.request&#039;, Object) (Line: 127)
Symfony\Component\HttpKernel\HttpKernel-&gt;handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel-&gt;handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle-&gt;handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache-&gt;pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache-&gt;handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware-&gt;handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware-&gt;handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel-&gt;handle(Object, 1, 1) (Line: 708)
Drupal\Core\DrupalKernel-&gt;handle(Object) (Line: 19)
";}}}_sf2_meta|a:3:{s:1:"u";i:1777483603;s:1:"c";i:1777483603;s:1:"l";s:7:"2000000";}')
session_write_close() (Line: 266)
Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->save() (Line: 198)
Drupal\Core\Session\SessionManager->save() (Line: 196)
Symfony\Component\HttpFoundation\Session\Session->save() (Line: 60)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 708)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)
Redirecting to /core/install.php Redirecting to /core/install.php.