当我运行autotest时,得到以下错误。奇怪的是,我没有文件夹/Library/Ruby/Gems/1.8/,而是文件夹/Library/Ruby/Gems/1.9.1/。Invalid gemspec in [/Library/Ruby/Gems/1.8/specifications/heroku-2.8.6.gemspec]: invalid date format in specification: "2011-10-07 00:00:00.000000000Z"
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