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] => jQscHGeKvqMh-0MDUmLcPzesMTWqqFWLKgGuO5Cgk_I ) in Drupal\Core\Session\SessionHandler->write() (line 84 of /var/www/html/new_trainee/core/lib/Drupal/Core/Session/SessionHandler.php).

Drupal\Core\Session\SessionHandler->write('R7cT1_xkyUGqCxpD1Oq_P9HLBD0I7HJgDGdHjUhKQHI', '_symfony_flashes|a:1:{s:5:"error";a:2:{i:0;O:25:"Drupal\Core\Render\Markup":1:{s:9:"*string";s:3079:"<em class="placeholder">Warning</em>: PDOStatement::execute(): MySQL server has gone away 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: 631)
Drupal\Core\Database\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_discovery} WHERE cid IN ( :cids__0 ) ORDER BY cid&#039;, Array, Array) (Line: 358)
Drupal\Core\Database\Driver\mysql\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_discovery} 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;library_info:traineeprogram&#039;) (Line: 340)
Drupal\Core\Cache\CacheCollector-&gt;lazyLoadCache() (Line: 144)
Drupal\Core\Cache\CacheCollector-&gt;get(&#039;core&#039;) (Line: 44)
Drupal\Core\Asset\LibraryDiscovery-&gt;getLibrariesByExtension(&#039;core&#039;) (Line: 58)
Drupal\Core\Asset\LibraryDiscovery-&gt;getLibraryByName(&#039;core&#039;, &#039;html5shiv&#039;) (Line: 54)
Drupal\Core\Asset\LibraryDependencyResolver-&gt;doGetDependencies(Array) (Line: 31)
Drupal\Core\Asset\LibraryDependencyResolver-&gt;getLibrariesWithDependencies(Array) (Line: 104)
Drupal\Core\Asset\AssetResolver-&gt;getLibrariesToLoad(Object) (Line: 116)
Drupal\Core\Asset\AssetResolver-&gt;getCssAssets(Object, 1) (Line: 315)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor-&gt;processAssetLibraries(Object, Array) (Line: 161)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor-&gt;processAttachments(Object) (Line: 94)
Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor-&gt;processAttachments(Object) (Line: 45)
Drupal\Core\EventSubscriber\HtmlResponseSubscriber-&gt;onRespond(Object, &#039;kernel.response&#039;, Object)
call_user_func(Array, Object, &#039;kernel.response&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.response&#039;, Object) (Line: 191)
Symfony\Component\HttpKernel\HttpKernel-&gt;filterResponse(Object, Object, 1) (Line: 173)
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: 693)
Drupal\Core\DrupalKernel-&gt;handle(Object) (Line: 19)
";}i:1;O:25:"Drupal\Core\Render\Markup":1:{s:9:"*string";s:3086:"<em class="placeholder">Warning</em>: PDOStatement::execute(): Error reading result set's header 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: 631)
Drupal\Core\Database\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_discovery} WHERE cid IN ( :cids__0 ) ORDER BY cid&#039;, Array, Array) (Line: 358)
Drupal\Core\Database\Driver\mysql\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_discovery} 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;library_info:traineeprogram&#039;) (Line: 340)
Drupal\Core\Cache\CacheCollector-&gt;lazyLoadCache() (Line: 144)
Drupal\Core\Cache\CacheCollector-&gt;get(&#039;core&#039;) (Line: 44)
Drupal\Core\Asset\LibraryDiscovery-&gt;getLibrariesByExtension(&#039;core&#039;) (Line: 58)
Drupal\Core\Asset\LibraryDiscovery-&gt;getLibraryByName(&#039;core&#039;, &#039;html5shiv&#039;) (Line: 54)
Drupal\Core\Asset\LibraryDependencyResolver-&gt;doGetDependencies(Array) (Line: 31)
Drupal\Core\Asset\LibraryDependencyResolver-&gt;getLibrariesWithDependencies(Array) (Line: 104)
Drupal\Core\Asset\AssetResolver-&gt;getLibrariesToLoad(Object) (Line: 116)
Drupal\Core\Asset\AssetResolver-&gt;getCssAssets(Object, 1) (Line: 315)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor-&gt;processAssetLibraries(Object, Array) (Line: 161)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor-&gt;processAttachments(Object) (Line: 94)
Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor-&gt;processAttachments(Object) (Line: 45)
Drupal\Core\EventSubscriber\HtmlResponseSubscriber-&gt;onRespond(Object, &#039;kernel.response&#039;, Object)
call_user_func(Array, Object, &#039;kernel.response&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.response&#039;, Object) (Line: 191)
Symfony\Component\HttpKernel\HttpKernel-&gt;filterResponse(Object, Object, 1) (Line: 173)
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: 693)
Drupal\Core\DrupalKernel-&gt;handle(Object) (Line: 19)
";}}}_sf2_meta|a:3:{s:1:"u";i:1732484080;s:1:"c";i:1732484080;s:1:"l";s:7:"2000000";}') (Line: 89)
Drupal\Core\Session\WriteSafeSessionHandler->write('R7cT1_xkyUGqCxpD1Oq_P9HLBD0I7HJgDGdHjUhKQHI', '_symfony_flashes|a:1:{s:5:"error";a:2:{i:0;O:25:"Drupal\Core\Render\Markup":1:{s:9:"*string";s:3079:"<em class="placeholder">Warning</em>: PDOStatement::execute(): MySQL server has gone away 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: 631)
Drupal\Core\Database\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_discovery} WHERE cid IN ( :cids__0 ) ORDER BY cid&#039;, Array, Array) (Line: 358)
Drupal\Core\Database\Driver\mysql\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_discovery} 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;library_info:traineeprogram&#039;) (Line: 340)
Drupal\Core\Cache\CacheCollector-&gt;lazyLoadCache() (Line: 144)
Drupal\Core\Cache\CacheCollector-&gt;get(&#039;core&#039;) (Line: 44)
Drupal\Core\Asset\LibraryDiscovery-&gt;getLibrariesByExtension(&#039;core&#039;) (Line: 58)
Drupal\Core\Asset\LibraryDiscovery-&gt;getLibraryByName(&#039;core&#039;, &#039;html5shiv&#039;) (Line: 54)
Drupal\Core\Asset\LibraryDependencyResolver-&gt;doGetDependencies(Array) (Line: 31)
Drupal\Core\Asset\LibraryDependencyResolver-&gt;getLibrariesWithDependencies(Array) (Line: 104)
Drupal\Core\Asset\AssetResolver-&gt;getLibrariesToLoad(Object) (Line: 116)
Drupal\Core\Asset\AssetResolver-&gt;getCssAssets(Object, 1) (Line: 315)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor-&gt;processAssetLibraries(Object, Array) (Line: 161)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor-&gt;processAttachments(Object) (Line: 94)
Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor-&gt;processAttachments(Object) (Line: 45)
Drupal\Core\EventSubscriber\HtmlResponseSubscriber-&gt;onRespond(Object, &#039;kernel.response&#039;, Object)
call_user_func(Array, Object, &#039;kernel.response&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.response&#039;, Object) (Line: 191)
Symfony\Component\HttpKernel\HttpKernel-&gt;filterResponse(Object, Object, 1) (Line: 173)
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: 693)
Drupal\Core\DrupalKernel-&gt;handle(Object) (Line: 19)
";}i:1;O:25:"Drupal\Core\Render\Markup":1:{s:9:"*string";s:3086:"<em class="placeholder">Warning</em>: PDOStatement::execute(): Error reading result set's header 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: 631)
Drupal\Core\Database\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_discovery} WHERE cid IN ( :cids__0 ) ORDER BY cid&#039;, Array, Array) (Line: 358)
Drupal\Core\Database\Driver\mysql\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_discovery} 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;library_info:traineeprogram&#039;) (Line: 340)
Drupal\Core\Cache\CacheCollector-&gt;lazyLoadCache() (Line: 144)
Drupal\Core\Cache\CacheCollector-&gt;get(&#039;core&#039;) (Line: 44)
Drupal\Core\Asset\LibraryDiscovery-&gt;getLibrariesByExtension(&#039;core&#039;) (Line: 58)
Drupal\Core\Asset\LibraryDiscovery-&gt;getLibraryByName(&#039;core&#039;, &#039;html5shiv&#039;) (Line: 54)
Drupal\Core\Asset\LibraryDependencyResolver-&gt;doGetDependencies(Array) (Line: 31)
Drupal\Core\Asset\LibraryDependencyResolver-&gt;getLibrariesWithDependencies(Array) (Line: 104)
Drupal\Core\Asset\AssetResolver-&gt;getLibrariesToLoad(Object) (Line: 116)
Drupal\Core\Asset\AssetResolver-&gt;getCssAssets(Object, 1) (Line: 315)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor-&gt;processAssetLibraries(Object, Array) (Line: 161)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor-&gt;processAttachments(Object) (Line: 94)
Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor-&gt;processAttachments(Object) (Line: 45)
Drupal\Core\EventSubscriber\HtmlResponseSubscriber-&gt;onRespond(Object, &#039;kernel.response&#039;, Object)
call_user_func(Array, Object, &#039;kernel.response&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.response&#039;, Object) (Line: 191)
Symfony\Component\HttpKernel\HttpKernel-&gt;filterResponse(Object, Object, 1) (Line: 173)
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: 693)
Drupal\Core\DrupalKernel-&gt;handle(Object) (Line: 19)
";}}}_sf2_meta|a:3:{s:1:"u";i:1732484080;s:1:"c";i:1732484080;s:1:"l";s:7:"2000000";}') (Line: 67)
Symfony\Component\HttpFoundation\Session\Storage\Proxy\SessionHandlerProxy->write('R7cT1_xkyUGqCxpD1Oq_P9HLBD0I7HJgDGdHjUhKQHI', '_symfony_flashes|a:1:{s:5:"error";a:2:{i:0;O:25:"Drupal\Core\Render\Markup":1:{s:9:"*string";s:3079:"<em class="placeholder">Warning</em>: PDOStatement::execute(): MySQL server has gone away 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: 631)
Drupal\Core\Database\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_discovery} WHERE cid IN ( :cids__0 ) ORDER BY cid&#039;, Array, Array) (Line: 358)
Drupal\Core\Database\Driver\mysql\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_discovery} 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;library_info:traineeprogram&#039;) (Line: 340)
Drupal\Core\Cache\CacheCollector-&gt;lazyLoadCache() (Line: 144)
Drupal\Core\Cache\CacheCollector-&gt;get(&#039;core&#039;) (Line: 44)
Drupal\Core\Asset\LibraryDiscovery-&gt;getLibrariesByExtension(&#039;core&#039;) (Line: 58)
Drupal\Core\Asset\LibraryDiscovery-&gt;getLibraryByName(&#039;core&#039;, &#039;html5shiv&#039;) (Line: 54)
Drupal\Core\Asset\LibraryDependencyResolver-&gt;doGetDependencies(Array) (Line: 31)
Drupal\Core\Asset\LibraryDependencyResolver-&gt;getLibrariesWithDependencies(Array) (Line: 104)
Drupal\Core\Asset\AssetResolver-&gt;getLibrariesToLoad(Object) (Line: 116)
Drupal\Core\Asset\AssetResolver-&gt;getCssAssets(Object, 1) (Line: 315)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor-&gt;processAssetLibraries(Object, Array) (Line: 161)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor-&gt;processAttachments(Object) (Line: 94)
Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor-&gt;processAttachments(Object) (Line: 45)
Drupal\Core\EventSubscriber\HtmlResponseSubscriber-&gt;onRespond(Object, &#039;kernel.response&#039;, Object)
call_user_func(Array, Object, &#039;kernel.response&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.response&#039;, Object) (Line: 191)
Symfony\Component\HttpKernel\HttpKernel-&gt;filterResponse(Object, Object, 1) (Line: 173)
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: 693)
Drupal\Core\DrupalKernel-&gt;handle(Object) (Line: 19)
";}i:1;O:25:"Drupal\Core\Render\Markup":1:{s:9:"*string";s:3086:"<em class="placeholder">Warning</em>: PDOStatement::execute(): Error reading result set's header 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: 631)
Drupal\Core\Database\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_discovery} WHERE cid IN ( :cids__0 ) ORDER BY cid&#039;, Array, Array) (Line: 358)
Drupal\Core\Database\Driver\mysql\Connection-&gt;query(&#039;SELECT cid, data, created, expire, serialized, tags, checksum FROM {cache_discovery} 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;library_info:traineeprogram&#039;) (Line: 340)
Drupal\Core\Cache\CacheCollector-&gt;lazyLoadCache() (Line: 144)
Drupal\Core\Cache\CacheCollector-&gt;get(&#039;core&#039;) (Line: 44)
Drupal\Core\Asset\LibraryDiscovery-&gt;getLibrariesByExtension(&#039;core&#039;) (Line: 58)
Drupal\Core\Asset\LibraryDiscovery-&gt;getLibraryByName(&#039;core&#039;, &#039;html5shiv&#039;) (Line: 54)
Drupal\Core\Asset\LibraryDependencyResolver-&gt;doGetDependencies(Array) (Line: 31)
Drupal\Core\Asset\LibraryDependencyResolver-&gt;getLibrariesWithDependencies(Array) (Line: 104)
Drupal\Core\Asset\AssetResolver-&gt;getLibrariesToLoad(Object) (Line: 116)
Drupal\Core\Asset\AssetResolver-&gt;getCssAssets(Object, 1) (Line: 315)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor-&gt;processAssetLibraries(Object, Array) (Line: 161)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor-&gt;processAttachments(Object) (Line: 94)
Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor-&gt;processAttachments(Object) (Line: 45)
Drupal\Core\EventSubscriber\HtmlResponseSubscriber-&gt;onRespond(Object, &#039;kernel.response&#039;, Object)
call_user_func(Array, Object, &#039;kernel.response&#039;, Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher-&gt;dispatch(&#039;kernel.response&#039;, Object) (Line: 191)
Symfony\Component\HttpKernel\HttpKernel-&gt;filterResponse(Object, Object, 1) (Line: 173)
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: 693)
Drupal\Core\DrupalKernel-&gt;handle(Object) (Line: 19)
";}}}_sf2_meta|a:3:{s:1:"u";i:1732484080;s:1:"c";i:1732484080;s:1:"l";s:7:"2000000";}')
session_write_close() (Line: 244)
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: 693)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Redirecting to /core/install.php Redirecting to /core/install.php. The website encountered an unexpected error. Please try again later.
Drupal\Core\Database\DatabaseExceptionWrapper: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: CREATE TABLE {semaphore} ( `name` VARCHAR(255) CHARACTER SET ascii COLLATE ascii_general_ci NOT NULL DEFAULT '' COMMENT 'Primary Key: Unique name.', `value` VARCHAR(255) CHARACTER SET ascii COLLATE ascii_general_ci NOT NULL DEFAULT '' COMMENT 'A value for the semaphore.', `expire` DOUBLE NOT NULL COMMENT 'A Unix timestamp with microseconds indicating when the semaphore should expire.', PRIMARY KEY (`name`), INDEX `value` (`value`), INDEX `expire` (`expire`) ) ENGINE = InnoDB DEFAULT CHARACTER SET utf8mb4 COMMENT 'Table for holding semaphores, locks, flags, etc. that…'; Array ( ) in Drupal\Core\Cache\CacheCollector->updateCache() (line 233 of core/lib/Drupal/Core/Cache/CacheCollector.php).

Drupal\Core\Cache\CacheCollector->updateCache() (Line: 327)
Drupal\Core\Cache\CacheCollector->destruct() (Line: 51)
Drupal\Core\EventSubscriber\KernelDestructionSubscriber->onKernelTerminate(Object, 'kernel.terminate', Object)
call_user_func(Array, Object, 'kernel.terminate', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.terminate', Object) (Line: 88)
Symfony\Component\HttpKernel\HttpKernel->terminate(Object, Object) (Line: 32)
Stack\StackedHttpKernel->terminate(Object, Object) (Line: 671)
Drupal\Core\DrupalKernel->terminate(Object, Object) (Line: 22)