I'm getting an error when building an Ionic 3 app
It seems that in the ionic forum there is a thread regarding this or a really similar issue: ionic forum link
To sum it up a bit, there is some issue with XCode or some dependencies not being at the expected place.
Could you try the following (add sudo if it fails for permission reasons):
npm install -g ios-deploy --unsafe-perm=true
I was also having this problem. Turns out all I had to do was disconnect my iPhone from the USB port.
- Disconnect any iOS devices from USB
- Build your app and wait until it finishes
- Reconnect the device