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Xcode gives me this message every-time I try running my app on my iPhone. (Works fine on the simulator.) (And this occurs in every project I have.) (I also just downloaded Xcode again.)
This is the message I get.
App Installation Failed.
Unknown Error Occurred.
How do I fix this error?
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Open up a project in Xcode and click on the device near the Run ▶ button at the top left of your Xcode screen. Plug your iPhone into your computer. You can select your device from the top of the list. Unlock your device and (⌘R) run the application.
Xcode is a complete developer toolset for creating apps for Mac, iPhone, iPad, Apple Watch, and Apple TV.
Xcode 12.4 includes SDKs for iOS 14.4, iPadOS 14.4, tvOS 14.3, watchOS 7.2, and macOS Big Sur 11.1. The Xcode 12.4 release supports on-device debugging for iOS 9 and later, tvOS 9 and later, and watchOS 2 and later. Xcode 12.4 requires a Mac running macOS 10.15. 4 or later.
Unplugging iOS Device and plugging it back it in fixed it for me.
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