After login as user, when I click on calendar
http://piwigo.us/beta/24/index.php?/cat … y-calendar
I receive following messages:

Notice: Undefined index: rotation in /home/sys/var/www/piwigo.us/beta/24/include/derivative.inc.php on line 63

Notice: Undefined index: rotation in /home/sys/var/www/piwigo.us/beta/24/include/derivative.inc.php on line 63

Warning: Cannot modify header information - headers already sent by (output started at /home/sys/var/www/piwigo.us/beta/24/include/derivative.inc.php:63) in /home/sys/var/www/piwigo.us/beta/24/include/page_header.php on line 118

Something isn't on good way.
Thanks
ANO