Warning: PDO::__construct(): The server requested authentication method unknown to the client [caching_sha2_password] in /var/www/html/framework/class/db.class.php on line 55

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY000] [2054] The server requested authentication method unknown to the client' in /var/www/html/framework/class/db.class.php:55 Stack trace: #0 /var/www/html/framework/class/db.class.php(55): PDO->__construct('mysql:dbname=yc...', 'root', 'mysqldb123456', Array) #1 /var/www/html/framework/class/db.class.php(25): DB->connect('master') #2 /var/www/html/framework/function/pdo.func.php(22): DB->__construct('master') #3 /var/www/html/framework/function/pdo.func.php(38): pdo() #4 /var/www/html/framework/function/cache.mysql.func.php(13): pdo_fetchcolumn('SELECT `value` ...', Array) #5 /var/www/html/framework/function/cache.func.php(31): cache_read('setting') #6 /var/www/html/framework/model/setting.mod.php(35): cache_load('setting') #7 /var/www/html/framework/bootstrap.inc.php(117): setting_load() #8 /var/www/html/index.php(6): require('/var/www/html/f...') #9 {main} thrown in /var/www/html/framework/class/db.class.php on line 55