CDbException

CDbConnection failed to open the DB connection: SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111) (/var/www/html/pi2015/framework/db/CDbConnection.php:399)

#0 /var/www/html/pi2015/framework/db/CDbConnection.php(347): CDbConnection->open()
#1 /var/www/html/pi2015/framework/db/CDbConnection.php(325): CDbConnection->setActive(true)
#2 /var/www/html/pi2015/framework/base/CModule.php(394): CDbConnection->init()
#3 /var/www/html/pi2015/framework/base/CApplication.php(458): CModule->getComponent('db')
#4 /var/www/html/pi2015/framework/db/ar/CActiveRecord.php(637): CApplication->getDb()
#5 /var/www/html/pi2015/framework/db/ar/CActiveRecord.php(670): CActiveRecord->getDbConnection()
#6 /var/www/html/pi2015/framework/db/ar/CActiveRecord.php(1460): CActiveRecord->getCommandBuilder()
#7 /var/www/html/pi2015/protected/controllers/SiteController.php(8): CActiveRecord->find()
#8 /var/www/html/pi2015/framework/web/CWebApplication.php(281): SiteController->init()
#9 /var/www/html/pi2015/framework/base/CErrorHandler.php(368): CWebApplication->runController('site/error')
#10 /var/www/html/pi2015/framework/base/CErrorHandler.php(351): CErrorHandler->renderError()
#11 /var/www/html/pi2015/framework/base/CErrorHandler.php(218): CErrorHandler->renderException()
#12 /var/www/html/pi2015/framework/base/CErrorHandler.php(131): CErrorHandler->handleException(Object(CHttpException))
#13 /var/www/html/pi2015/framework/base/CApplication.php(740): CErrorHandler->handle(Object(CExceptionEvent))
#14 [internal function]: CApplication->handleException(Object(CHttpException))
#15 {main}