Warning: mysqli::mysqli(): (HY000/2002): Connection timed out in /var/www/sdb/d/1/joojle/piwigo/include/dblayer/functions_mysqli.inc.php on line 52

Warning: my_error(): Couldn't fetch mysqli in /var/www/sdb/d/1/joojle/piwigo/include/dblayer/functions_mysqli.inc.php on line 839

Warning: my_error(): Couldn't fetch mysqli in /var/www/sdb/d/1/joojle/piwigo/include/dblayer/functions_mysqli.inc.php on line 839

Piwigo encountered an unrecoverable error

[mysql error ] 
Cannot connect to server

#1	my_error /var/www/sdb/d/1/joojle/piwigo/admin/include/functions_upgrade.php(319)
#2	upgrade_db_connect /var/www/sdb/d/1/joojle/piwigo/upgrade.php(199)

Fatal error: [mysql error ] Cannot connect to server #1 my_error /var/www/sdb/d/1/joojle/piwigo/admin/include/functions_upgrade.php(319) #2 upgrade_db_connect /var/www/sdb/d/1/joojle/piwigo/upgrade.php(199) in /var/www/sdb/d/1/joojle/piwigo/include/functions_html.inc.php on line 388