An Error occurred while handling another error:
PDOException: SQLSTATE[HY000] [2002] No route to host in /var/www/html/vendor/yiisoft/yii2/db/Connection.php:719
Stack trace:
#0 /var/www/html/vendor/yiisoft/yii2/db/Connection.php(719): PDO->__construct()
#1 /var/www/html/vendor/yiisoft/yii2/db/Connection.php(638): yii\db\Connection->createPdoInstance()
#2 /var/www/html/vendor/yiisoft/yii2/db/Connection.php(1059): yii\db\Connection->open()
#3 /var/www/html/vendor/yiisoft/yii2/db/Connection.php(1046): yii\db\Connection->getMasterPdo()
#4 /var/www/html/vendor/yiisoft/yii2/db/mysql/QueryBuilder.php(406): yii\db\Connection->getSlavePdo()
#5 /var/www/html/vendor/yiisoft/yii2/db/mysql/QueryBuilder.php(430): yii\db\mysql\QueryBuilder->supportsFractionalSeconds()
#6 /var/www/html/vendor/yiisoft/yii2/db/mysql/QueryBuilder.php(59): yii\db\mysql\QueryBuilder->defaultTimeTypeMap()
#7 /var/www/html/vendor/yiisoft/yii2/base/BaseObject.php(110): yii\db\mysql\QueryBuilder->init()
#8 /var/www/html/vendor/yiisoft/yii2/db/QueryBuilder.php(116): yii\base\BaseObject->__construct()
#9 /var/www/html/vendor/yiisoft/yii2/db/mysql/Schema.php(217): yii\db\QueryBuilder->__construct()
#10 /var/www/html/vendor/yiisoft/yii2/db/Schema.php(249): yii\db\mysql\Schema->createQueryBuilder()
#11 /var/www/html/vendor/yiisoft/yii2/db/Connection.php(876): yii\db\Schema->getQueryBuilder()
#12 /var/www/html/vendor/yiisoft/yii2/db/Query.php(157): yii\db\Connection->getQueryBuilder()
#13 /var/www/html/vendor/yiisoft/yii2/db/Query.php(304): yii\db\Query->createCommand()
#14 /var/www/html/vendor/yiisoft/yii2/web/DbSession.php(190): yii\db\Query->scalar()
#15 [internal function]: yii\web\DbSession->readSession()
#16 /var/www/html/vendor/yiisoft/yii2/web/Session.php(157): session_start()
#17 /var/www/html/vendor/yiisoft/yii2/web/Session.php(733): yii\web\Session->open()
#18 /var/www/html/views/site/error.php(13): yii\web\Session->get()
#19 /var/www/html/vendor/yiisoft/yii2/base/View.php(348): require('...')
#20 /var/www/html/vendor/yiisoft/yii2/base/View.php(257): yii\base\View->renderPhpFile()
#21 /var/www/html/vendor/yiisoft/yii2/base/View.php(156): yii\base\View->renderFile()
#22 /var/www/html/vendor/yiisoft/yii2/base/Controller.php(410): yii\base\View->render()
#23 /var/www/html/vendor/yiisoft/yii2/web/ErrorAction.php(139): yii\base\Controller->render()
#24 /var/www/html/vendor/yiisoft/yii2/web/ErrorAction.php(118): yii\web\ErrorAction->renderHtmlResponse()
#25 [internal function]: yii\web\ErrorAction->run()
#26 /var/www/html/vendor/yiisoft/yii2/base/Action.php(94): call_user_func_array()
#27 /var/www/html/vendor/yiisoft/yii2/base/Controller.php(181): yii\base\Action->runWithParams()
#28 /var/www/html/vendor/yiisoft/yii2/base/Module.php(536): yii\base\Controller->runAction()
#29 /var/www/html/vendor/yiisoft/yii2/web/ErrorHandler.php(112): yii\base\Module->runAction()
#30 /var/www/html/vendor/yiisoft/yii2/base/ErrorHandler.php(143): yii\web\ErrorHandler->renderException()
#31 [internal function]: yii\base\ErrorHandler->handleException()
#32 {main}

Next yii\db\Exception: SQLSTATE[HY000] [2002] No route to host in /var/www/html/vendor/yiisoft/yii2/db/Connection.php:649
Stack trace:
#0 /var/www/html/vendor/yiisoft/yii2/db/Connection.php(1059): yii\db\Connection->open()
#1 /var/www/html/vendor/yiisoft/yii2/db/Connection.php(1046): yii\db\Connection->getMasterPdo()
#2 /var/www/html/vendor/yiisoft/yii2/db/mysql/QueryBuilder.php(406): yii\db\Connection->getSlavePdo()
#3 /var/www/html/vendor/yiisoft/yii2/db/mysql/QueryBuilder.php(430): yii\db\mysql\QueryBuilder->supportsFractionalSeconds()
#4 /var/www/html/vendor/yiisoft/yii2/db/mysql/QueryBuilder.php(59): yii\db\mysql\QueryBuilder->defaultTimeTypeMap()
#5 /var/www/html/vendor/yiisoft/yii2/base/BaseObject.php(110): yii\db\mysql\QueryBuilder->init()
#6 /var/www/html/vendor/yiisoft/yii2/db/QueryBuilder.php(116): yii\base\BaseObject->__construct()
#7 /var/www/html/vendor/yiisoft/yii2/db/mysql/Schema.php(217): yii\db\QueryBuilder->__construct()
#8 /var/www/html/vendor/yiisoft/yii2/db/Schema.php(249): yii\db\mysql\Schema->createQueryBuilder()
#9 /var/www/html/vendor/yiisoft/yii2/db/Connection.php(876): yii\db\Schema->getQueryBuilder()
#10 /var/www/html/vendor/yiisoft/yii2/db/Query.php(157): yii\db\Connection->getQueryBuilder()
#11 /var/www/html/vendor/yiisoft/yii2/db/Query.php(304): yii\db\Query->createCommand()
#12 /var/www/html/vendor/yiisoft/yii2/web/DbSession.php(190): yii\db\Query->scalar()
#13 [internal function]: yii\web\DbSession->readSession()
#14 /var/www/html/vendor/yiisoft/yii2/web/Session.php(157): session_start()
#15 /var/www/html/vendor/yiisoft/yii2/web/Session.php(733): yii\web\Session->open()
#16 /var/www/html/views/site/error.php(13): yii\web\Session->get()
#17 /var/www/html/vendor/yiisoft/yii2/base/View.php(348): require('...')
#18 /var/www/html/vendor/yiisoft/yii2/base/View.php(257): yii\base\View->renderPhpFile()
#19 /var/www/html/vendor/yiisoft/yii2/base/View.php(156): yii\base\View->renderFile()
#20 /var/www/html/vendor/yiisoft/yii2/base/Controller.php(410): yii\base\View->render()
#21 /var/www/html/vendor/yiisoft/yii2/web/ErrorAction.php(139): yii\base\Controller->render()
#22 /var/www/html/vendor/yiisoft/yii2/web/ErrorAction.php(118): yii\web\ErrorAction->renderHtmlResponse()
#23 [internal function]: yii\web\ErrorAction->run()
#24 /var/www/html/vendor/yiisoft/yii2/base/Action.php(94): call_user_func_array()
#25 /var/www/html/vendor/yiisoft/yii2/base/Controller.php(181): yii\base\Action->runWithParams()
#26 /var/www/html/vendor/yiisoft/yii2/base/Module.php(536): yii\base\Controller->runAction()
#27 /var/www/html/vendor/yiisoft/yii2/web/ErrorHandler.php(112): yii\base\Module->runAction()
#28 /var/www/html/vendor/yiisoft/yii2/base/ErrorHandler.php(143): yii\web\ErrorHandler->renderException()
#29 [internal function]: yii\base\ErrorHandler->handleException()
#30 {main}
Additional Information:
Array
(
    [0] => HY000
    [1] => 2002
    [2] => No route to host
)

Previous exception:
yii\base\InvalidRouteException: Unable to resolve the request "sitemap.xml". in /var/www/html/vendor/yiisoft/yii2/base/Module.php:545
Stack trace:
#0 /var/www/html/vendor/yiisoft/yii2/web/Application.php(105): yii\base\Module->runAction()
#1 /var/www/html/vendor/yiisoft/yii2/base/Application.php(392): yii\web\Application->handleRequest()
#2 /var/www/html/web/index.php(21): yii\base\Application->run()
#3 {main}

Next yii\web\NotFoundHttpException: Page not found. in /var/www/html/vendor/yiisoft/yii2/web/Application.php:117
Stack trace:
#0 /var/www/html/vendor/yiisoft/yii2/base/Application.php(392): yii\web\Application->handleRequest()
#1 /var/www/html/web/index.php(21): yii\base\Application->run()
#2 {main}