Net::Google::Spreadsheets 500 error, what am I doing wrong? - perl

Question

I'm trying to use Net::Google::Spreadsheets to manipulate a Google Docs spreadsheet (side note: you may have seen my previous question where I was trying to work from the inside of Google Docs, now I'm trying a different angle)
I'm trying an example pretty much straight out of the perldoc:
#!/usr/bin/perl
use strict;
use warnings;
use Net::Google::Spreadsheets;
my $service = Net::Google::Spreadsheets->new(
username => 'my.email#gmail.com',
password => 'mypassword'
);
my #spreadsheets = $service->spreadsheets();
# find a spreadsheet by key
my $spreadsheet = $service->spreadsheet(
{
title => 'Perl Test' # This is a spreadsheet I manually created already
}
);
# find a worksheet by title
my $worksheet = $spreadsheet->worksheet(
{
title => 'Sheet1'
}
);
my $cell = $worksheet->cell({col => 1, row => 1});
# update input value of a cell
$cell->input_value('new value');
When I run my code, I get this error:
request for 'https://spreadsheets.google.com/feeds/worksheets/tNdoUPkz7MhRAtVoBaaZVHQ/private/full?title=Sheet1' failed:
500 Internal Server Error
Internal Error
at /usr/local/share/perl/5.10.1/Net/Google/DataAPI/Role/Service.pm line 96
Net::Google::DataAPI::Role::Service::request('Net::Google::Spreadsheets=HASH(0x167ce60)', 'HASH(0x1c63ba8)') called at /usr/local/share/perl/5.10.1/Net/Google/DataAPI/Role/Service.pm line 158
Net::Google::DataAPI::Role::Service::get_feed('Net::Google::Spreadsheets=HASH(0x167ce60)', 'https://spreadsheets.google.com/feeds/worksheets/tNdoUPkz7MhR...', 'HASH(0x1a38d58)') called at /usr/local/share/perl/5.10.1/Net/Google/DataAPI.pm line 106
Net::Google::Spreadsheets::Spreadsheet::worksheets('Net::Google::Spreadsheets::Spreadsheet=HASH(0x1a36460)', 'HASH(0x1a38d58)') called at /usr/local/share/perl/5.10.1/Net/Google/DataAPI.pm line 119
Net::Google::Spreadsheets::Spreadsheet::worksheet('Net::Google::Spreadsheets::Spreadsheet=HASH(0x1a36460)', 'HASH(0x1a38d58)') called at spreadsheet_test.pl line 22
And then if I try to open up the Perl Test spreadsheet from within Google Docs, Google itself gives me the equivalent of a 500 error.
So what am I doing wrong?