Xcode true Machine Debug failed: The identity used to sign the executable is no longer valid

In Xcode suddenly for a long time did not use the real machine debugging, today when using the real machine, the following warning appears, and the real machine failed to run:

The identity used to sign the executable is no longer valid.

Please verify this your device ' s clock is proprtly Set,and that your signing certificate are not expired. (0xe8008018).

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In fact, the problem is very simple, Xcode is to tell you that the identity of the authentication has expired, you need to re-sign authentication. The solution is also simple:

Choose Xcode->preferences->accounts, and there should be a red exclamation point next to it. Xcode prompts you to re-enter your Apple ID and password and re-enter the verification. Then you can debug the real machine.

Xcode true Machine Debug failed: The identity used to sign the executable is no longer valid