System error

error:  Can't use an undefined value as an ARRAY reference at /www/bushong.net/htdocs/wiki.old/m/Diff line 59.
context: 
... 
55:  $rcs->date(revision => '1.' . $ARGS{$_}))));
56:  }
57: 
58:  ## generate unified diff
59:  @diff = @{$rcs->diff(
60:  revision1 => '1.' . $rev1,
61:  revision2 => '1.' . $rev2,
62:  )};
63: 
... 
code stack:  /www/bushong.net/htdocs/wiki.old/m/Diff:59
/www/bushong.net/htdocs/wiki.old/dhandler:9
raw error






























Can't use an undefined value as an ARRAY reference at /www/bushong.net/htdocs/wiki.old/m/Diff line 59.


Trace begun at /usr/share/perl5/HTML/Mason/Exceptions.pm line 125
HTML::Mason::Exceptions::rethrow_exception('Can\'t use an undefined value as an ARRAY reference at /www/bushong.net/htdocs/wiki.old/m/Diff line 59.^J') called at /www/bushong.net/htdocs/wiki.old/m/Diff line 59
HTML::Mason::Commands::__ANON__('rev2', 3, 'path', 'Adventure/Sniper\'s Armor') called at /usr/share/perl5/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x5563c4f499d8)', 'rev2', 3, 'path', 'Adventure/Sniper\'s Armor') 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, 'rev2', 3, 'path', 'Adventure/Sniper\'s Armor') called at /www/bushong.net/htdocs/wiki.old/dhandler line 9
HTML::Mason::Commands::__ANON__('rev2', 3) called at /usr/share/perl5/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x5563c4f3c410)', 'rev2', 3) called at /usr/share/perl5/HTML/Mason/Request.pm line 1300
eval {...} at /usr/share/perl5/HTML/Mason/Request.pm line 1292
HTML::Mason::Request::comp(undef, undef, undef, 'rev2', 3) 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(0x5563c4f3bd68)') called at /usr/share/perl5/HTML/Mason/ApacheHandler.pm line 165
HTML::Mason::Request::ApacheHandler::exec('HTML::Mason::Request::ApacheHandler=HASH(0x5563c4f3bd68)') called at /usr/share/perl5/HTML/Mason/ApacheHandler.pm line 831
HTML::Mason::ApacheHandler::handle_request('HTML::Mason::ApacheHandler=HASH(0x5563c4f2c910)', 'Apache2::RequestRec=SCALAR(0x5563c2e28258)') called at /etc/apache2/HTML/Mason/Bushong.pm line 99
HTML::Mason::Bushong::handler('Apache2::RequestRec=SCALAR(0x5563c2e28258)') called at -e line 0
eval {...} at -e line 0