Fatal error: Uncaught exception Exception with message Could not connect to database (Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (12)) thrown in …/system/libraries/Database.php on line 78

#0 …/system/libraries/Database.php(135): Database->__construct()
#1 [internal function]: Database::getInstance()
#2 …/system/libraries/System.php(176): call_user_func(Array)
#3 …/system/libraries/Model.php(86): System->import('Database')
#4 …/system/modules/frontend/FrontendUser.php(91): Model->__construct()
#5 …/system/modules/frontend/FrontendUser.php(173): FrontendUser->__construct()
#6 [internal function]: FrontendUser::getInstance()
#7 …/system/libraries/System.php(176): call_user_func(Array)
#8 …/index.php(65): System->import('FrontendUser', 'User')
#9 …/index.php(400): Index->__construct()
#10 {main}