koha-opac-error_log

[Wed May 30 00:06:29 2012] [error] [client 213.87.140.181] [Wed May 30 00:06:29 2012] Client.pm: defined(@array) is deprecated at /opt/perl5/lib/site_perl/5.16.0/Authen/CAS/Client.pm line 67.
[Wed May 30 00:06:29 2012] [error] [client 213.87.140.181] [Wed May 30 00:06:29 2012] Client.pm: \t(Maybe you should just omit the defined()?)
[Wed May 30 00:06:44 2012] [error] [client 213.87.140.181] [Wed May 30 00:06:44 2012] Client.pm: defined(@array) is deprecated at /opt/perl5/lib/site_perl/5.16.0/Authen/CAS/Client.pm line 67., referer: http://www.library.koyauniversity.org/
[Wed May 30 00:06:44 2012] [error] [client 213.87.140.181] [Wed May 30 00:06:44 2012] Client.pm: \t(Maybe you should just omit the defined()?), referer: http://www.library.koyauniversity.org/
[Wed May 30 00:06:44 2012] [error] [client 213.87.140.181] [Wed May 30 00:06:44 2012] opac-user.pl: DBD::mysql::st execute failed: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 at /usr/share/koha/lib/C4/Letters.pm line 209., referer: http://www.library.koyauniversity.org/
[Wed May 30 00:06:44 2012] [error] [client 213.87.140.181] [Wed May 30 00:06:44 2012] opac-user.pl: Can't use an undefined value as an ARRAY reference at /opt/perl5/lib/site_perl/5.16.0/x86_64-linux-thread-multi/DBI.pm line 2054., referer: http://www.library.koyauniversity.org/