Many thanks to all of you for the help! @haptic, @jsequoia, @pax26 I was finally able to solve it. I’m incredibly grateful, since it was extremely important and I was running out of time. The final solution was to completely delete Xcode via Terminal and then re-download it. The package remains intact, and now everything runs perfectly. It also works on the devices now. I only had to replace import SwiftCoreUI with import SwiftUI, otherwise everything runs really smoothly.

Hi Ed, thanks for the quick reply. I tried to reply directly in the forum with the requested output, but I keep receiving an error message ("Your post couldn’t be saved. Please try again in a few minutes."). It seems I cannot currently post a follow-up reply. The output: zsh: command not found: devicectl