System error

error:  Can't call method "fix_checksum" on an undefined value at /usr/lib/perl5/site_perl/5.8.8/Business/ISBN13.pm line 78.
context: 
... 
74:  {
75:  my $self = shift;
76: 
77:  my $isbn13 = Business::ISBN->new( $self->as_string );
78:  $isbn13->fix_checksum;
79: 
80:  return $isbn13;
81:  }
82: 
... 
code stack:  /usr/lib/perl5/site_perl/5.8.8/Business/ISBN13.pm:78
/data/branches/trunk/websites/search/look.html:216
/data/branches/trunk/websites/inv/dhandler:92
/data/branches/trunk/websites/website_body.html:53
/data/branches/trunk/websites/autohandler:428
/usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Request.pm:836
/data/branches/trunk/websites/autohandler:7
raw error






























Can't call method "fix_checksum" on an undefined value at /usr/lib/perl5/site_perl/5.8.8/Business/ISBN13.pm line 78.


Trace begun at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Exceptions.pm line 129
HTML::Mason::Exceptions::rethrow_exception('Can\'t call method "fix_checksum" on an undefined value at /usr/lib/perl5/site_perl/5.8.8/Business/ISBN13.pm line 78.^J') called at /usr/lib/perl5/site_perl/5.8.8/Business/ISBN13.pm line 78
Business::ISBN13::as_isbn13('Business::ISBN13=HASH(0x8ca7180)', 0724358234428) called at /data/branches/trunk/websites/search/look.html line 216
HTML::Mason::Commands::__ANON__('inventory_id', 2174761) called at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x842c760)', 'inventory_id', 2174761) called at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Request.pm line 1279
eval {...} at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Request.pm line 1274
HTML::Mason::Request::comp(undef, undef, 'inventory_id', 2174761) called at /data/branches/trunk/websites/inv/dhandler line 92
HTML::Mason::Commands::__ANON__('skin', 'HASH(0x89f1f00)', 'page', undef, 'status', undef, 'section', 'Inv', 'secure_mode', 'http', 'location_id', 1) called at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x80f83f0)', 'skin', 'HASH(0x89f1f00)', 'page', undef, 'status', undef, 'section', 'Inv', 'secure_mode', 'http', 'location_id', 1) called at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Request.pm line 1284
eval {...} at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Request.pm line 1274
HTML::Mason::Request::comp(undef, undef, undef, 'skin', 'HASH(0x89f1f00)', 'page', undef, 'status', undef, 'section', 'Inv', 'secure_mode', 'http', 'location_id', 1) called at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Request.pm line 943
HTML::Mason::Request::call_next('HTML::Mason::Request::ApacheHandler=HASH(0x8bf1a00)') called at /data/branches/trunk/websites/website_body.html line 53
HTML::Mason::Commands::__ANON__('skin', 'HASH(0x89f1f00)', 'page', undef, 'status', undef, 'section', 'Inv', 'secure_mode', 'http', 'location_id', 1) called at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x83e0a70)', 'skin', 'HASH(0x89f1f00)', 'page', undef, 'status', undef, 'section', 'Inv', 'secure_mode', 'http', 'location_id', 1) called at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Request.pm line 1284
eval {...} at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Request.pm line 1274
HTML::Mason::Request::comp(undef, undef, 'skin', 'HASH(0x89f1f00)', 'page', undef, 'status', undef, 'section', 'Inv', 'secure_mode', 'http', 'location_id', 1) called at /data/branches/trunk/websites/autohandler line 428
HTML::Mason::Commands::__ANON__ at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x8362910)') called at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Request.pm line 907
eval {...} at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Request.pm line 906
HTML::Mason::Request::call_self('HTML::Mason::Request::ApacheHandler=HASH(0x8bf1a00)', 'SCALAR(0x367a380)', 'ARRAY(0x367a3c0)', 'SCALAR(0x367a3a0)', 'CACHE_SELF') called at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Request.pm line 836
HTML::Mason::Request::cache_self('HTML::Mason::Request::ApacheHandler=HASH(0x8bf1a00)', 'expire_in', '5 s', 'key', 'www.loremipsumbooks.com,/inv/2174761,,!') called at /data/branches/trunk/websites/autohandler line 7
HTML::Mason::Commands::__ANON__ at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x8362910)') called at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Request.pm line 1279
eval {...} at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Request.pm line 1274
HTML::Mason::Request::comp(undef, undef, undef) called at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Request.pm line 473
eval {...} at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Request.pm line 473
eval {...} at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/Request.pm line 425
HTML::Mason::Request::exec('HTML::Mason::Request::ApacheHandler=HASH(0x8bf1a00)') called at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/ApacheHandler.pm line 168
HTML::Mason::Request::ApacheHandler::exec('HTML::Mason::Request::ApacheHandler=HASH(0x8bf1a00)') called at /usr/lib/perl5/site_perl/5.8.8/HTML/Mason/ApacheHandler.pm line 825
HTML::Mason::ApacheHandler::handle_request('HTML::Mason::ApacheHandler=HASH(0x7e21e20)', 'Apache::Request=SCALAR(0x8b1e230)') called at /data/branches/trunk/lib/BookStore/MasonWebSites.pm line 165
eval {...} at /data/branches/trunk/lib/BookStore/MasonWebSites.pm line 164
BookStore::MasonWebSites::handler('Apache=SCALAR(0x8abacb0)') called at /dev/null line 0
eval {...} at /dev/null line 0