App installation failed: Could not write to the device

Question

In Xcode 6.3, I got this error when trying to run an iOS project written in Swift on a real device.

App installation failed

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Answer 1

For me the following did not work on iOS 11 beta 10, XCode 9 beta 6:

• Restart the device
• Deleting the app from the device
• No symlinks were in the project
• There was plenty of storage available

Deleted Derived Data and voilá, it worked again