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:4075:"<em class="placeholder">Warning</em>: Error while sending QUERY packet. PID=18275 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_render} 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_render} 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;entity_view:block:wechat:[languages:language_interface]=en:[theme]=octo:[user.permissions]=d45218c4a3c2c40eb6877a2b566c3a25e1639775fb84c2ba60e6620d1ea6bb0a&#039;) (Line: 71)
Drupal\Core\Render\RenderCache-&gt;get(Array) (Line: 109)
Drupal\Core\Render\PlaceholderingRenderCache-&gt;get(Array) (Line: 265)
Drupal\Core\Render\Renderer-&gt;doRender(Array) (Line: 444)
Drupal\Core\Render\Renderer-&gt;doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer-&gt;render(Array) (Line: 501)
Drupal\Core\Template\TwigExtension-&gt;escapeFilter(Object, Array, &#039;html&#039;, NULL, 1) (Line: 146)
__TwigTemplate_f0180dd89ea8da1b6bbbbde8cd4089ed0c08864b04b66bbfdf4c9f833b4954e8-&gt;doDisplay(Array, Array) (Line: 455)
Twig\Template-&gt;displayWithErrorHandling(Array, Array) (Line: 422)
Twig\Template-&gt;display(Array) (Line: 434)
Twig\Template-&gt;render(Array) (Line: 64)
twig_render_template(&#039;themes/octo/templates/page.html.twig&#039;, Array) (Line: 384)
Drupal\Core\Theme\ThemeManager-&gt;render(&#039;page&#039;, Array) (Line: 431)
Drupal\Core\Render\Renderer-&gt;doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer-&gt;render(Array) (Line: 501)
Drupal\Core\Template\TwigExtension-&gt;escapeFilter(Object, Array, &#039;html&#039;, NULL, 1) (Line: 96)
__TwigTemplate_50c12396a027ad9171190829481d864f1521ba6113b97a1797a15a358e1699c7-&gt;doDisplay(Array, Array) (Line: 455)
Twig\Template-&gt;displayWithErrorHandling(Array, Array) (Line: 422)
Twig\Template-&gt;display(Array) (Line: 434)
Twig\Template-&gt;render(Array) (Line: 64)
twig_render_template(&#039;themes/octo/templates/html.html.twig&#039;, Array) (Line: 384)
Drupal\Core\Theme\ThemeManager-&gt;render(&#039;html&#039;, Array) (Line: 431)
Drupal\Core\Render\Renderer-&gt;doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer-&gt;render(Array) (Line: 147)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;Drupal\Core\Render\MainContent\{closure}() (Line: 573)
Drupal\Core\Render\Renderer-&gt;executeInRenderContext(Object, Object) (Line: 148)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber-&gt;onViewRenderArray(Object, &#039;kernel.view&#039;, Object)
call_user_func(Array, Object, &#039;kernel.view&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.view&#039;, Object) (Line: 156)
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:1777483602;s:1:"c";i:1777483602;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:4075:"<em class="placeholder">Warning</em>: Error while sending QUERY packet. PID=18275 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_render} 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_render} 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;entity_view:block:wechat:[languages:language_interface]=en:[theme]=octo:[user.permissions]=d45218c4a3c2c40eb6877a2b566c3a25e1639775fb84c2ba60e6620d1ea6bb0a&#039;) (Line: 71)
Drupal\Core\Render\RenderCache-&gt;get(Array) (Line: 109)
Drupal\Core\Render\PlaceholderingRenderCache-&gt;get(Array) (Line: 265)
Drupal\Core\Render\Renderer-&gt;doRender(Array) (Line: 444)
Drupal\Core\Render\Renderer-&gt;doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer-&gt;render(Array) (Line: 501)
Drupal\Core\Template\TwigExtension-&gt;escapeFilter(Object, Array, &#039;html&#039;, NULL, 1) (Line: 146)
__TwigTemplate_f0180dd89ea8da1b6bbbbde8cd4089ed0c08864b04b66bbfdf4c9f833b4954e8-&gt;doDisplay(Array, Array) (Line: 455)
Twig\Template-&gt;displayWithErrorHandling(Array, Array) (Line: 422)
Twig\Template-&gt;display(Array) (Line: 434)
Twig\Template-&gt;render(Array) (Line: 64)
twig_render_template(&#039;themes/octo/templates/page.html.twig&#039;, Array) (Line: 384)
Drupal\Core\Theme\ThemeManager-&gt;render(&#039;page&#039;, Array) (Line: 431)
Drupal\Core\Render\Renderer-&gt;doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer-&gt;render(Array) (Line: 501)
Drupal\Core\Template\TwigExtension-&gt;escapeFilter(Object, Array, &#039;html&#039;, NULL, 1) (Line: 96)
__TwigTemplate_50c12396a027ad9171190829481d864f1521ba6113b97a1797a15a358e1699c7-&gt;doDisplay(Array, Array) (Line: 455)
Twig\Template-&gt;displayWithErrorHandling(Array, Array) (Line: 422)
Twig\Template-&gt;display(Array) (Line: 434)
Twig\Template-&gt;render(Array) (Line: 64)
twig_render_template(&#039;themes/octo/templates/html.html.twig&#039;, Array) (Line: 384)
Drupal\Core\Theme\ThemeManager-&gt;render(&#039;html&#039;, Array) (Line: 431)
Drupal\Core\Render\Renderer-&gt;doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer-&gt;render(Array) (Line: 147)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;Drupal\Core\Render\MainContent\{closure}() (Line: 573)
Drupal\Core\Render\Renderer-&gt;executeInRenderContext(Object, Object) (Line: 148)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber-&gt;onViewRenderArray(Object, &#039;kernel.view&#039;, Object)
call_user_func(Array, Object, &#039;kernel.view&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.view&#039;, Object) (Line: 156)
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:1777483602;s:1:"c";i:1777483602;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:4075:"<em class="placeholder">Warning</em>: Error while sending QUERY packet. PID=18275 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_render} 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_render} 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;entity_view:block:wechat:[languages:language_interface]=en:[theme]=octo:[user.permissions]=d45218c4a3c2c40eb6877a2b566c3a25e1639775fb84c2ba60e6620d1ea6bb0a&#039;) (Line: 71)
Drupal\Core\Render\RenderCache-&gt;get(Array) (Line: 109)
Drupal\Core\Render\PlaceholderingRenderCache-&gt;get(Array) (Line: 265)
Drupal\Core\Render\Renderer-&gt;doRender(Array) (Line: 444)
Drupal\Core\Render\Renderer-&gt;doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer-&gt;render(Array) (Line: 501)
Drupal\Core\Template\TwigExtension-&gt;escapeFilter(Object, Array, &#039;html&#039;, NULL, 1) (Line: 146)
__TwigTemplate_f0180dd89ea8da1b6bbbbde8cd4089ed0c08864b04b66bbfdf4c9f833b4954e8-&gt;doDisplay(Array, Array) (Line: 455)
Twig\Template-&gt;displayWithErrorHandling(Array, Array) (Line: 422)
Twig\Template-&gt;display(Array) (Line: 434)
Twig\Template-&gt;render(Array) (Line: 64)
twig_render_template(&#039;themes/octo/templates/page.html.twig&#039;, Array) (Line: 384)
Drupal\Core\Theme\ThemeManager-&gt;render(&#039;page&#039;, Array) (Line: 431)
Drupal\Core\Render\Renderer-&gt;doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer-&gt;render(Array) (Line: 501)
Drupal\Core\Template\TwigExtension-&gt;escapeFilter(Object, Array, &#039;html&#039;, NULL, 1) (Line: 96)
__TwigTemplate_50c12396a027ad9171190829481d864f1521ba6113b97a1797a15a358e1699c7-&gt;doDisplay(Array, Array) (Line: 455)
Twig\Template-&gt;displayWithErrorHandling(Array, Array) (Line: 422)
Twig\Template-&gt;display(Array) (Line: 434)
Twig\Template-&gt;render(Array) (Line: 64)
twig_render_template(&#039;themes/octo/templates/html.html.twig&#039;, Array) (Line: 384)
Drupal\Core\Theme\ThemeManager-&gt;render(&#039;html&#039;, Array) (Line: 431)
Drupal\Core\Render\Renderer-&gt;doRender(Array, ) (Line: 200)
Drupal\Core\Render\Renderer-&gt;render(Array) (Line: 147)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;Drupal\Core\Render\MainContent\{closure}() (Line: 573)
Drupal\Core\Render\Renderer-&gt;executeInRenderContext(Object, Object) (Line: 148)
Drupal\Core\Render\MainContent\HtmlRenderer-&gt;renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber-&gt;onViewRenderArray(Object, &#039;kernel.view&#039;, Object)
call_user_func(Array, Object, &#039;kernel.view&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.view&#039;, Object) (Line: 156)
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:1777483602;s:1:"c";i:1777483602;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.