For Xcode Beta 9.3 (9.4 and 9.5): Apple really recognizes something very similar to a bug in Xcode 9.3 beta. The beta 2 release notes say: "The first time you trust a device, you may receive a message stating that the device cannot run executable files for the device architecture. (35319190) Workaround: Error message is incorrect. Disable and reconnect the device. "
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