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我正在使用 Xcode 4.5.2 和 MacRuby 0.12。我需要使用电子表格 gem，但是当我尝试执行我的程序时，我一直遇到“签名”问题：

/Library/Ruby/Gems/MacRuby/0.13/gems/ruby-ole-1.2.11.5/lib/ole/storage/base.rb:372:in `validate!': OLE2 signature is invalid (Ole::Storage::FormatError)
    from /Library/Ruby/Gems/MacRuby/0.13/gems/ruby-ole-1.2.11.5/lib/ole/storage/base.rb:364:in `initialize'
    from /Library/Ruby/Gems/MacRuby/0.13/gems/ruby-ole-1.2.11.5/lib/ole/storage/base.rb:105:in `load'
    from /Library/Ruby/Gems/MacRuby/0.13/gems/ruby-ole-1.2.11.5/lib/ole/storage/base.rb:72:in `initialize'
    from /Library/Ruby/Gems/MacRuby/0.13/gems/ruby-ole-1.2.11.5/lib/ole/storage/base.rb:78:in `open'
    from /Library/Ruby/Gems/MacRuby/0.13/gems/spreadsheet-0.7.4/lib/spreadsheet/excel/reader.rb:1179:in `setup'
    from /Library/Ruby/Gems/MacRuby/0.13/gems/spreadsheet-0.7.4/lib/spreadsheet/excel/reader.rb:121:in `read'
    from /Library/Ruby/Gems/MacRuby/0.13/gems/spreadsheet-0.7.4/lib/spreadsheet/excel/workbook.rb:32:in `open'
    from /Library/Ruby/Gems/MacRuby/0.13/gems/spreadsheet-0.7.4/lib/spreadsheet.rb:62:in `open'
    from /Library/Ruby/Gems/MacRuby/0.13/gems/spreadsheet-0.7.4/lib/spreadsheet.rb:68:in `open'

OLE gem 是否与 MacRuby 兼容？我在这里有什么选择？

谢谢你的帮助。

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