SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error: mysqlnd cannot connect to MySQL 4.1+ using the old insecure authentication. Please use an administration tool to reset your password with the command SET PASSWORD = PASSWORD('your_existing_password'). This will store a new, and more secure, hash value in mysql.user. If this user is used in other scripts executed by PHP 5.2 or earlier you might need to remove the old-passwords flag from your my.cnf file
mysql error number: 2000
mysql version: unknown
php version: 5.6.40-29+0~20200514.35+debian10~1.gbpcc49a4
Date: 07.08.2020 @ 02:17
Script: /board.php?boardid=25
Referer: