Piwigo encountered a non recoverable error

[mysql error 1044] Access denied for user 'kenc8555_piwi240'@'localhost' to database 'kenc8555_piwi240'
Connection to server succeed, but it was impossible to connect to database

#1	my_error /home/kenc8555/public_html/gallery/include/common.inc.php(121)
#2	include_once /home/kenc8555/public_html/gallery/about.php(26)