Tk::Error: Can't call method "ZIPARCHIVECLASS" on an undefined value at
/home/jv/lib/perl5/Archive/Zip.pm line 220. Archive::Zip::new at
/home/jv/lib/perl5/Archive/Zip.pm line 220
App::Music::ChordPro::Archive::save at
/home/jv/src/ChordPro/lib/App/Music/ChordPro/Archive.pm line 140
main::save_archive_as at cpdb.pl line 641 main::__ANON__ at cpdb.pl line
235 Tk callback for .frame.menubutton.menu Tk::__ANON__ at
/usr/lib64/perl5/vendor_perl/Tk.pm line 251 Tk::Menu::Invoke at
/usr/lib64/perl5/vendor_perl/Tk/Menu.pm line 532 <ButtonRelease>
(command bound to event)