Piwigo encountered a non recoverable error

[mysql error 2054] The server requested authentication method unknown to the client
Can't connect to server

#1	my_error /home1/rlh2006/public_html/mediagal/include/common.inc.php(129)
#2	include_once /home1/rlh2006/public_html/mediagal/index.php(26)