Failed to prepare device for development
Unfortunately this is a super confusing issue in Xcode iOS environment, especially for those who are new to development. Developers sometimes think this issue has something to do with development environment (certificates, profiles etc.)
Before going to steps in fixing this issue, its wise to save your code changes
Steps to fix this issue. Follow in order.
- Delete derived data
- Xcode -> Product -> Clean Build Folder
- Xcode -> Preferences -> Locations -> Derived Data -> Delete folder with your workspace name
- Unplug your iPhone/iPad
- Restart Xcode
- Connect your iPhone
- and try building it again
If above doesn’t work,
- Repeat all the steps above
- Restart your mac
- Restart your iPhone/iPad
- and try again
If you still face the error, try re-installing xcode or updating xcode. I hope apple fixes this issue asap.