System error

error:  Can't use an undefined value as an ARRAY reference at /opt/vifapol_www/htdocs/mason/cnav.mas line 81.
context: 
... 
77:  $mode = 1;
78:  }
79:  }
80:  else {
81:  $num = @{$cnav->{'links'}};
82:  $selected = $cnav->{'selected'};
83:  }
84:  my $prev = $selected - 1;
85:  $prev = $num - 1 if $prev < 0;
... 
code stack:  /opt/vifapol_www/htdocs/mason/cnav.mas:81
/opt/vifapol_www/htdocs/mason/autohandler.mas:221
raw error






























Can't use an undefined value as an ARRAY reference at /opt/vifapol_www/htdocs/mason/cnav.mas line 81.


Trace begun at /usr/local/share/perl/5.8.8/HTML/Mason/Exceptions.pm line 129
HTML::Mason::Exceptions::rethrow_exception('Can\'t use an undefined value as an ARRAY reference at /opt/vifapol_www/htdocs/mason/cnav.mas line 81.^J') called at /opt/vifapol_www/htdocs/mason/cnav.mas line 81
HTML::Mason::Commands::__ANON__('cnav', undef) called at /usr/local/share/perl/5.8.8/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x9711bf8)', 'cnav', undef) called at /usr/local/share/perl/5.8.8/HTML/Mason/Request.pm line 1262
eval {...} at /usr/local/share/perl/5.8.8/HTML/Mason/Request.pm line 1252
HTML::Mason::Request::comp(undef, undef, undef, 'cnav', undef) called at /usr/local/share/perl/5.8.8/HTML/Mason/Request.pm line 1310
HTML::Mason::Request::scomp('HTML::Mason::Request::ApacheHandler=HASH(0x93fe19c)', '/cnav.mas', 'cnav', undef) called at /opt/vifapol_www/htdocs/mason/autohandler.mas line 221
HTML::Mason::Commands::__ANON__ at /usr/local/share/perl/5.8.8/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x96f43e0)') called at /usr/local/share/perl/5.8.8/HTML/Mason/Request.pm line 1257
eval {...} at /usr/local/share/perl/5.8.8/HTML/Mason/Request.pm line 1252
HTML::Mason::Request::comp(undef, undef, undef) called at /usr/local/share/perl/5.8.8/HTML/Mason/Request.pm line 466
eval {...} at /usr/local/share/perl/5.8.8/HTML/Mason/Request.pm line 466
eval {...} at /usr/local/share/perl/5.8.8/HTML/Mason/Request.pm line 418
HTML::Mason::Request::exec('HTML::Mason::Request::ApacheHandler=HASH(0x93fe19c)') called at /usr/local/share/perl/5.8.8/HTML/Mason/ApacheHandler.pm line 168
HTML::Mason::Request::ApacheHandler::exec('HTML::Mason::Request::ApacheHandler=HASH(0x93fe19c)') called at /usr/local/share/perl/5.8.8/HTML/Mason/ApacheHandler.pm line 826
HTML::Mason::ApacheHandler::handle_request('HTML::Mason::ApacheHandler=HASH(0x8813514)', 'Apache2::RequestRec=SCALAR(0x8e59b28)') called at (eval 30) line 8
HTML::Mason::ApacheHandler::handler('HTML::Mason::ApacheHandler', 'Apache2::RequestRec=SCALAR(0x8e59b28)') called at -e line 0
eval {...} at -e line 0