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The certificate used to sign "XXX" has either expired or has been revoked. An updated certificate is required to sign and install the application.
Xcode -> Preferences -> Accounts -> View Details 然后分成上下两栏，上栏全部Reset一下，下栏左下角 Download All即可解决上述问题
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原文地址：http://www.cnblogs.com/caojingkun/p/5667135.html
