'App installation failed. An unknown error has occurred.' Is displayed when debugging iPhone with Xcode

What happened

“App installation failed. An unknown error has occurred.” is displayed and can not be executed when running an application under creation using MacBook Pro (2017) + Xcode 8.3 on iPhone. Before this message, Xcode worked fine, but suddenly I could not debug.

Xcode「App installation failed. An unknown error has occurred.」

How did I solve it?

It was not solved by the following method.

  • Remove app on iPhone
  • Xcode cache deletion
  • mac restart
  • Restart iPhone

The error message was ** An unknown error has occurred. **. In such a case, we are suspected of device malfunction. I removed the USB type-C HUB once and tried it on.

mac USB Type-C HUB

** This device seemed to be the cause **, so you can transfer applications to iPhone and debug with Xcode. I lost a hour of time …

Additional Information

ios - Xcode 8 App installation failed, unknown error occured - Stack Overflow

ios - Xcode 8 App installation failed, unknown error occured - Stack Overflow