Fatal error: Cannot use database usr_web21_1

You get more information about the problem in our knowledge base: http://www.woltlab.com/help/?code=1044

Information:

error message: Cannot use database usr_web21_1
error code: 1044
sql type: MySQLDatabase
sql error: Access denied for user 'web21'@'178.254.62.160' to database 'usr_web21_1'
sql error number: 1044
sql version:
file: /var/www/web21/html/wcf/lib/system/database/MySQLDatabase.class.php (57)
php version: 5.3.29
wcf version: 1.0.11 pl 1 (Horizon)
date: Sat, 27 Nov 2021 03:57:10 +0000
request: /index.php?form=Search&s=e720608401b8b889c34ce568dbea7cf40153f99c&styleID=8&s=2d5b3a59a81fdf65b374c12ff8e20dea0b673d77&styleID=27&s=b4fda75c127e9ef5abe0d9dabbe76bc10f49f83a&styleID=28&s=68de3b5c0e8d49bc7a011fa55e8c07623e752c50&styleID=24&s=ec1cdb2d0080c3e232f5e880be069e5ce608215b&styleID=5&s=7f60cc07213b3411b6b681bfa492d1ce5b63322c&styleID=17&s=0648a359bd8abaa58bbba6f7d36358a5001b4132&styleID=33&s=d6985b16256eea3e2bf99fd94a2da9d663d00bf8&styleID=11&s=fb8a6ff4dd34bfba501f11ef7e60e6751f6c4a81&styleID=16&s=e5a2fa40376af04b38fe611e1974527cd1ea1de4
referer:

Stacktrace:

#0 /var/www/web21/html/wcf/lib/system/database/Database.class.php(79): MySQLDatabase->selectDatabase()
#1 /var/www/web21/html/wcf/lib/system/WCF.class.php(270): Database->__construct(...)
#2 /var/www/web21/html/wcf/lib/system/WCF.class.php(88): WCF->initDB()
#3 /var/www/web21/html/global.php(18): WCF->__construct()
#4 /var/www/web21/html/index.php(7): require_once('/var/www/web21/...')
#5 {main}