Piwigo encountered a non recoverable error

[mysql error ] 
Can't connect to server

#1	my_error /mnt/133/sda/5/5/eric.voyage2/phpwebgallery/include/common.inc.php(140)
#2	include_once /mnt/133/sda/5/5/eric.voyage2/phpwebgallery/index.php(26)

Fatal error: [mysql error ] Can't connect to server #1 my_error /mnt/133/sda/5/5/eric.voyage2/phpwebgallery/include/common.inc.php(140) #2 include_once /mnt/133/sda/5/5/eric.voyage2/phpwebgallery/index.php(26) in /mnt/133/sda/5/5/eric.voyage2/phpwebgallery/include/functions_html.inc.php on line 428