The identity used to sign the executable is no longer valid.

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问题的出现如下, 常常用一个账号在多台mac上面进行开发的朋友可能会遇到.

The identity used to sign the executable is no longer valid.Please verify that your device’s clock is properly set, and that your signing certificate is not expired.(0xE8008018).

解决方案有两种
1.重启Xcode(如果不行,用下种方式)
2.解决方案在Xcode内部:
Preferences --> Accounts --> View Details
点击你的开发者账号,没有的话创建一个, 把所有证书下载下来
点击Download all按钮 (Xcode 7)

PS:
有时候你可能还需要删除无效的证书.

http://stackoverflow.com/questions/7088441/the-identity-used-to-sign-the-executable-is-no-longer-valid