Net :: Google :: Spreadsheets 500错误，我做错了什么？

Question

我正在尝试使用Net :: Google :: Spreadsheets来操作Google文档电子表格（旁注：您可能已经看过我之前在Google Docs内部尝试工作的问题，现在我正在尝试一个不同的角度）

我正在尝试一个非常直接来自perldoc的例子：

     #!/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');

当我运行我的代码时，我收到此错误：

    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

然后，如果我尝试从Google文档中打开Perl测试电子表格，Google本身就会给我相当于500的错误。

那么我做错了什么？