SQLSTATE[08004] [1040] Too many connections<br><pre>#0 [internal function]: PDO->__construct()
#1 [internal function]: Phalcon\Db\Adapter\Pdo\AbstractPdo->connect()
#2 D:\Websites\dtn2.ou.edu.vn\backend\config\services.php(57): Phalcon\Db\Adapter\Pdo\AbstractPdo->__construct()
#3 [internal function]: Closure->{closure}()
#4 [internal function]: Phalcon\Di\Service->resolve()
#5 [internal function]: Phalcon\Di\Di->get()
#6 [internal function]: Phalcon\Di\Di->getShared()
#7 [internal function]: Phalcon\Mvc\Model\Manager->getConnection()
#8 [internal function]: Phalcon\Mvc\Model\Manager->getReadConnection()
#9 [internal function]: Phalcon\Mvc\Model->getReadConnection()
#10 [internal function]: Phalcon\Mvc\Model\MetaData\Strategy\Introspection->getMetaData()
#11 [internal function]: Phalcon\Mvc\Model\MetaData->initializeMetaData()
#12 [internal function]: Phalcon\Mvc\Model\MetaData->getMetaDataUniqueKey()
#13 [internal function]: Phalcon\Mvc\Model\MetaData->readMetaData()
#14 [internal function]: Phalcon\Mvc\Model\MetaData->hasAttribute()
#15 [internal function]: Phalcon\Mvc\Model\Query->getQualified()
#16 [internal function]: Phalcon\Mvc\Model\Query->getExpression()
#17 [internal function]: Phalcon\Mvc\Model\Query->getExpression()
#18 [internal function]: Phalcon\Mvc\Model\Query->_prepareSelect()
#19 [internal function]: Phalcon\Mvc\Model\Query->parse()
#20 [internal function]: Phalcon\Mvc\Model\Query->execute()
#21 D:\Websites\dtn2.ou.edu.vn\backend\models\Privilege.php(169): Phalcon\Mvc\Model::findFirst()
#22 D:\Websites\dtn2.ou.edu.vn\backend\middlewares\RouterMiddleware.php(55): Privilege::findFirst()
#23 D:\Websites\dtn2.ou.edu.vn\backend\middlewares\RouterMiddleware.php(183): RouterMiddleware->setAuthorizeParam()
#24 D:\Websites\dtn2.ou.edu.vn\backend\controllers\module\ClientController.php(8): RouterMiddleware->initialize()
#25 [internal function]: ClientController->initialize()
#26 [internal function]: Phalcon\Dispatcher\AbstractDispatcher->dispatch()
#27 D:\Websites\dtn2.ou.edu.vn\public\index.php(25): Phalcon\Mvc\Application->handle()
#28 {main}</pre>