System error

error:  Can't use an undefined value as an ARRAY reference at /srv/piperka.net/piperka/readers.html line 2, <RELATED> line 137.
context: 
1:  % if ($cid > 0) {
2:  % if (@{$readers->{readers}} > 0) {
3:  <h2>People subscribed to <% $readers->{title} | h %></h2>
4:  <p>These people have subscribed to
5:  <a href="info.html?cid=<% $cid %>"><% $readers->{title} | h %></a> and have their profiles
6:  set public or shared it with you.
... 
code stack:  /srv/piperka.net/piperka/readers.html:2
/srv/piperka.net/piperka/autohandler:79
raw error






























Can't use an undefined value as an ARRAY reference at /srv/piperka.net/piperka/readers.html line 2, <RELATED> line 137.


Trace begun at /usr/share/perl5/HTML/Mason/Exceptions.pm line 129
HTML::Mason::Exceptions::rethrow_exception('Can\'t use an undefined value as an ARRAY reference at /srv/piperka.net/piperka/readers.html line 2, <RELATED> line 137.^J') called at /srv/piperka.net/piperka/readers.html line 2
HTML::Mason::Commands::__ANON__('cid', 720, 'account', 'Piperka::Account=HASH(0x7f79225e1f60)', 'dbh', 'Apache::DBI::db=HASH(0x7f793d1b21a8)', 'bookmarks_str', '', 'cid', 720, 'cache', 'Moose::Meta::Class::__ANON__::SERIAL::1=HASH(0x7f793d0d9608)') called at /usr/share/perl5/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x7f793e908f30)', 'cid', 720, 'account', 'Piperka::Account=HASH(0x7f79225e1f60)', 'dbh', 'Apache::DBI::db=HASH(0x7f793d1b21a8)', 'bookmarks_str', '', 'cid', 720, 'cache', 'Moose::Meta::Class::__ANON__::SERIAL::1=HASH(0x7f793d0d9608)') called at /usr/share/perl5/HTML/Mason/Request.pm line 1302
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 1292
HTML::Mason::Request::comp(undef, undef, undef, 'cid', 720, 'account', 'Piperka::Account=HASH(0x7f79225e1f60)', 'dbh', 'Apache::DBI::db=HASH(0x7f793d1b21a8)', 'bookmarks_str', '', 'cid', 720, 'cache', 'Moose::Meta::Class::__ANON__::SERIAL::1=HASH(0x7f793d0d9608)') called at /usr/share/perl5/HTML/Mason/Request.pm line 955
HTML::Mason::Request::call_next('HTML::Mason::Request::ApacheHandler=HASH(0x7f793ea50268)', 'account', 'Piperka::Account=HASH(0x7f79225e1f60)', 'dbh', 'Apache::DBI::db=HASH(0x7f793d1b21a8)', 'bookmarks_str', '', 'cid', 720, 'cache', 'Moose::Meta::Class::__ANON__::SERIAL::1=HASH(0x7f793d0d9608)') called at /srv/piperka.net/piperka/autohandler line 79
HTML::Mason::Commands::__ANON__('cid', 720) called at /usr/share/perl5/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x7f79209cb298)', 'cid', 720) called at /usr/share/perl5/HTML/Mason/Request.pm line 1297
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 1292
HTML::Mason::Request::comp(undef, undef, undef, 'cid', 720) called at /usr/share/perl5/HTML/Mason/Request.pm line 481
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 481
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 433
HTML::Mason::Request::exec('HTML::Mason::Request::ApacheHandler=HASH(0x7f793ea50268)') called at /usr/share/perl5/HTML/Mason/ApacheHandler.pm line 165
HTML::Mason::Request::ApacheHandler::exec('HTML::Mason::Request::ApacheHandler=HASH(0x7f793ea50268)') called at /usr/share/perl5/HTML/Mason/ApacheHandler.pm line 831
HTML::Mason::ApacheHandler::handle_request('HTML::Mason::ApacheHandler=HASH(0x7f793c92c9e8)', 'Apache2::RequestRec=SCALAR(0x7f793e9a4fe0)') called at (eval 30) line 8
HTML::Mason::ApacheHandler::handler('HTML::Mason::ApacheHandler', 'Apache2::RequestRec=SCALAR(0x7f793e9a4fe0)') called at -e line 0
eval {...} at -e line 0