Piwigo encountered a non recoverable error

[mysql error 1044] Access denied for user 'web295'@'localhost' to database 'usr_web295_1'
Connection to server succeed, but it was impossible to connect to database

#1	my_error /var/www/vhosts/h203961.web21.alfahosting-server.de/html/piwigo/include/common.inc.php(128)
#2	include_once /var/www/vhosts/h203961.web21.alfahosting-server.de/html/piwigo/picture.php(25)