本文主要是介绍在keychain tool里，Request a certificate时，出错''The specified item could not be found in the keychain，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
解决办法是：restart keychain tool, and then 在keychain tool里，不要选择"keys" item，应该选择"all items"，and then try again! （make sure you see "Let me specify key pair information" option in first wizard window, if you can't see it, may still fail)
ref link: http://stackoverflow.com/questions/16845169/error-when-trying-to-obtain-a-certificate-the-specified-item-could-not-be-found
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